Attempt to define a Call on the provider resource

It seems like this doesn't work, since the Provider doesn't see the resulting
`Call`. Instead, the built-in `pulumi` provider receives the `Call`, then errors:

<details>
<summary> `pulumi up` result </summary>

```console
$ pulumi up
Previewing update (dev)

View in Browser (Ctrl+O): https://app.pulumi.com/pulumi/dev/dev/previews/490ebc68-af05-49e7-96a2-e6182339ce67

Loading policy packs...

     Type                      Name               Plan       Info
 +   pulumi:pulumi:Stack       dev-dev            create     1 error
 +   └─ pulumi:providers:test  explicit-provider  create

Policies:
    ✅ [email protected]

Diagnostics:
  pulumi:pulumi:Stack (dev-dev):
    error: Program failed with an unhandled exception:
    Traceback (most recent call last):
      File "/Users/ianwahbe/go/src/github.com/pulumi/pulumi-go-provider/examples/call/consumer/venv/lib/python3.12/site-packages/pulumi/runtime/invoke.py", line 361, in do_rpc_call
        return monitor.Call(req)
               ^^^^^^^^^^^^^^^^^
      File "/Users/ianwahbe/go/src/github.com/pulumi/pulumi-go-provider/examples/call/consumer/venv/lib/python3.12/site-packages/grpc/_channel.py", line 1160, in __call__
        return _end_unary_response_blocking(state, call, False, None)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/Users/ianwahbe/go/src/github.com/pulumi/pulumi-go-provider/examples/call/consumer/venv/lib/python3.12/site-packages/grpc/_channel.py", line 1003, in _end_unary_response_blocking
        raise _InactiveRpcError(state)  # pytype: disable=not-instantiable
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    grpc._channel._InactiveRpcError: <_InactiveRpcError of RPC that terminated with:
        status = StatusCode.UNKNOWN
        details = "call of pulumi:providers:test/makePet returned an error: the builtin provider does not implement call"
        debug_error_string = "UNKNOWN:Error received from peer  {created_time:"2024-08-20T17:33:11.944431+02:00", grpc_status:2, grpc_message:"call of pulumi:providers:test/makePet returned an error: the builtin provider does not implement call"}"
    >

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File "/Users/ianwahbe/go/bin/pulumi-language-python-exec", line 197, in <module>
        loop.run_until_complete(coro)
      File "/opt/homebrew/Cellar/[email protected]/3.12.3/Frameworks/Python.framework/Versions/3.12/lib/python3.12/asyncio/base_events.py", line 687, in run_until_complete
        return future.result()
               ^^^^^^^^^^^^^^^
      File "/Users/ianwahbe/go/src/github.com/pulumi/pulumi-go-provider/examples/call/consumer/venv/lib/python3.12/site-packages/pulumi/runtime/stack.py", line 142, in run_in_stack
        await run_pulumi_func(run)
      File "/Users/ianwahbe/go/src/github.com/pulumi/pulumi-go-provider/examples/call/consumer/venv/lib/python3.12/site-packages/pulumi/runtime/stack.py", line 56, in run_pulumi_func
        await wait_for_rpcs()
      File "/Users/ianwahbe/go/src/github.com/pulumi/pulumi-go-provider/examples/call/consumer/venv/lib/python3.12/site-packages/pulumi/runtime/stack.py", line 118, in wait_for_rpcs
        await task
      File "/Users/ianwahbe/go/src/github.com/pulumi/pulumi-go-provider/examples/call/consumer/venv/lib/python3.12/site-packages/pulumi/runtime/invoke.py", line 366, in do_call
        resp = await asyncio.get_event_loop().run_in_executor(None, do_rpc_call)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/opt/homebrew/Cellar/[email protected]/3.12.3/Frameworks/Python.framework/Versions/3.12/lib/python3.12/concurrent/futures/thread.py", line 58, in run
        result = self.fn(*self.args, **self.kwargs)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/Users/ianwahbe/go/src/github.com/pulumi/pulumi-go-provider/examples/call/consumer/venv/lib/python3.12/site-packages/pulumi/runtime/invoke.py", line 363, in do_rpc_call
        handle_grpc_error(exn)
      File "/Users/ianwahbe/go/src/github.com/pulumi/pulumi-go-provider/examples/call/consumer/venv/lib/python3.12/site-packages/pulumi/runtime/settings.py", line 307, in handle_grpc_error
        raise grpc_error_to_exception(exn)
    Exception: call of pulumi:providers:test/makePet returned an error: the builtin provider does not implement callg
```

</details>

examples/call/PulumiPlugin.yaml

@@ -0,0 +1 @@
+runtime: go

examples/call/consumer/.gitignore

@@ -0,0 +1,2 @@
+venv
+__pycache__

examples/call/consumer/Pulumi.yaml

@@ -0,0 +1,6 @@
+runtime: python
+name: dev
+plugins:
+  providers:
+    - name: test
+      path: ..

examples/call/consumer/__main__.py

@@ -0,0 +1,5 @@
+import pulumi_test as test
+
+p = test.Provider("explicit-provider")
+
+p.make_pet()

examples/call/consumer/requirements.txt

@@ -0,0 +1,2 @@
+pulumi>=v1.129.0
+sdks/test

examples/call/consumer/sdks/test/build/lib/pulumi_test/__init__.py

@@ -0,0 +1,23 @@
+# coding=utf-8
+# *** WARNING: this file was generated by pulumi-language-python. ***
+# *** Do not edit by hand unless you're certain you know what you are doing! ***
+
+from . import _utilities
+import typing
+# Export this package's modules as members:
+from .provider import *
+_utilities.register(
+    resource_modules="""
+[]
+""",
+    resource_packages="""
+[
+ {
+  "pkg": "test",
+  "token": "pulumi:providers:test",
+  "fqn": "pulumi_test",
+  "class": "Provider"
+ }
+]
+"""
+)

examples/call/consumer/sdks/test/build/lib/pulumi_test/_utilities.py

@@ -0,0 +1,327 @@
+# coding=utf-8
+# *** WARNING: this file was generated by pulumi-language-python. ***
+# *** Do not edit by hand unless you're certain you know what you are doing! ***
+
+
+import asyncio
+import functools
+import importlib.metadata
+import importlib.util
+import inspect
+import json
+import os
+import sys
+import typing
+import warnings
+import base64
+
+import pulumi
+import pulumi.runtime
+from pulumi.runtime.sync_await import _sync_await
+from pulumi.runtime.proto import resource_pb2
+
+from semver import VersionInfo as SemverVersion
+from parver import Version as PEP440Version
+
+C = typing.TypeVar("C", bound=typing.Callable)
+
+
+def get_env(*args):
+    for v in args:
+        value = os.getenv(v)
+        if value is not None:
+            return value
+    return None
+
+
+def get_env_bool(*args):
+    str = get_env(*args)
+    if str is not None:
+        # NOTE: these values are taken from https://golang.org/src/strconv/atob.go?s=351:391#L1, which is what
+        # Terraform uses internally when parsing boolean values.
+        if str in ["1", "t", "T", "true", "TRUE", "True"]:
+            return True
+        if str in ["0", "f", "F", "false", "FALSE", "False"]:
+            return False
+    return None
+
+
+def get_env_int(*args):
+    str = get_env(*args)
+    if str is not None:
+        try:
+            return int(str)
+        except:
+            return None
+    return None
+
+
+def get_env_float(*args):
+    str = get_env(*args)
+    if str is not None:
+        try:
+            return float(str)
+        except:
+            return None
+    return None
+
+
+def _get_semver_version():
+    # __name__ is set to the fully-qualified name of the current module, In our case, it will be
+    # <some module>._utilities. <some module> is the module we want to query the version for.
+    root_package, *rest = __name__.split('.')
+
+    # pkg_resources uses setuptools to inspect the set of installed packages. We use it here to ask
+    # for the currently installed version of the root package (i.e. us) and get its version.
+
+    # Unfortunately, PEP440 and semver differ slightly in incompatible ways. The Pulumi engine expects
+    # to receive a valid semver string when receiving requests from the language host, so it's our
+    # responsibility as the library to convert our own PEP440 version into a valid semver string.
+
+    pep440_version_string = importlib.metadata.version(root_package)
+    pep440_version = PEP440Version.parse(pep440_version_string)
+    (major, minor, patch) = pep440_version.release
+    prerelease = None
+    if pep440_version.pre_tag == 'a':
+        prerelease = f"alpha.{pep440_version.pre}"
+    elif pep440_version.pre_tag == 'b':
+        prerelease = f"beta.{pep440_version.pre}"
+    elif pep440_version.pre_tag == 'rc':
+        prerelease = f"rc.{pep440_version.pre}"
+    elif pep440_version.dev is not None:
+        prerelease = f"dev.{pep440_version.dev}"
+
+    # The only significant difference between PEP440 and semver as it pertains to us is that PEP440 has explicit support
+    # for dev builds, while semver encodes them as "prerelease" versions. In order to bridge between the two, we convert
+    # our dev build version into a prerelease tag. This matches what all of our other packages do when constructing
+    # their own semver string.
+    return SemverVersion(major=major, minor=minor, patch=patch, prerelease=prerelease)
+
+
+# Determine the version once and cache the value, which measurably improves program performance.
+_version = _get_semver_version()
+_version_str = str(_version)
+
+def get_resource_opts_defaults() -> pulumi.ResourceOptions:
+    return pulumi.ResourceOptions(
+        version=get_version(),
+        plugin_download_url=get_plugin_download_url(),
+    )
+
+def get_invoke_opts_defaults() -> pulumi.InvokeOptions:
+    return pulumi.InvokeOptions(
+        version=get_version(),
+        plugin_download_url=get_plugin_download_url(),
+    )
+
+def get_resource_args_opts(resource_args_type, resource_options_type, *args, **kwargs):
+    """
+    Return the resource args and options given the *args and **kwargs of a resource's
+    __init__ method.
+    """
+
+    resource_args, opts = None, None
+
+    # If the first item is the resource args type, save it and remove it from the args list.
+    if args and isinstance(args[0], resource_args_type):
+        resource_args, args = args[0], args[1:]
+
+    # Now look at the first item in the args list again.
+    # If the first item is the resource options class, save it.
+    if args and isinstance(args[0], resource_options_type):
+        opts = args[0]
+
+    # If resource_args is None, see if "args" is in kwargs, and, if so, if it's typed as the
+    # the resource args type.
+    if resource_args is None:
+        a = kwargs.get("args")
+        if isinstance(a, resource_args_type):
+            resource_args = a
+
+    # If opts is None, look it up in kwargs.
+    if opts is None:
+        opts = kwargs.get("opts")
+
+    return resource_args, opts
+
+
+# Temporary: just use pulumi._utils.lazy_import once everyone upgrades.
+def lazy_import(fullname):
+
+    import pulumi._utils as u
+    f = getattr(u, 'lazy_import', None)
+    if f is None:
+        f = _lazy_import_temp
+
+    return f(fullname)
+
+
+# Copied from pulumi._utils.lazy_import, see comments there.
+def _lazy_import_temp(fullname):
+    m = sys.modules.get(fullname, None)
+    if m is not None:
+        return m
+
+    spec = importlib.util.find_spec(fullname)
+
+    m = sys.modules.get(fullname, None)
+    if m is not None:
+        return m
+
+    loader = importlib.util.LazyLoader(spec.loader)
+    spec.loader = loader
+    module = importlib.util.module_from_spec(spec)
+
+    m = sys.modules.get(fullname, None)
+    if m is not None:
+        return m
+
+    sys.modules[fullname] = module
+    loader.exec_module(module)
+    return module
+
+
+class Package(pulumi.runtime.ResourcePackage):
+    def __init__(self, pkg_info):
+        super().__init__()
+        self.pkg_info = pkg_info
+
+    def version(self):
+        return _version
+
+    def construct_provider(self, name: str, typ: str, urn: str) -> pulumi.ProviderResource:
+        if typ != self.pkg_info['token']:
+            raise Exception(f"unknown provider type {typ}")
+        Provider = getattr(lazy_import(self.pkg_info['fqn']), self.pkg_info['class'])
+        return Provider(name, pulumi.ResourceOptions(urn=urn))
+
+
+class Module(pulumi.runtime.ResourceModule):
+    def __init__(self, mod_info):
+        super().__init__()
+        self.mod_info = mod_info
+
+    def version(self):
+        return _version
+
+    def construct(self, name: str, typ: str, urn: str) -> pulumi.Resource:
+        class_name = self.mod_info['classes'].get(typ, None)
+
+        if class_name is None:
+            raise Exception(f"unknown resource type {typ}")
+
+        TheClass = getattr(lazy_import(self.mod_info['fqn']), class_name)
+        return TheClass(name, pulumi.ResourceOptions(urn=urn))
+
+
+def register(resource_modules, resource_packages):
+    resource_modules = json.loads(resource_modules)
+    resource_packages = json.loads(resource_packages)
+
+    for pkg_info in resource_packages:
+        pulumi.runtime.register_resource_package(pkg_info['pkg'], Package(pkg_info))
+
+    for mod_info in resource_modules:
+        pulumi.runtime.register_resource_module(
+            mod_info['pkg'],
+            mod_info['mod'],
+            Module(mod_info))
+
+
+_F = typing.TypeVar('_F', bound=typing.Callable[..., typing.Any])
+
+
+def lift_output_func(func: typing.Any) -> typing.Callable[[_F], _F]:
+    """Decorator internally used on {fn}_output lifted function versions
+    to implement them automatically from the un-lifted function."""
+
+    func_sig = inspect.signature(func)
+
+    def lifted_func(*args, opts=None, **kwargs):
+        bound_args = func_sig.bind(*args, **kwargs)
+        # Convert tuple to list, see pulumi/pulumi#8172
+        args_list = list(bound_args.args)
+        return pulumi.Output.from_input({
+            'args': args_list,
+            'kwargs': bound_args.kwargs
+        }).apply(lambda resolved_args: func(*resolved_args['args'],
+                                            opts=opts,
+                                            **resolved_args['kwargs']))
+
+    return (lambda _: lifted_func)
+
+
+def call_plain(
+    tok: str,
+    props: pulumi.Inputs,
+    res: typing.Optional[pulumi.Resource] = None,
+    typ: typing.Optional[type] = None,
+) -> typing.Any:
+    """
+    Wraps pulumi.runtime.plain to force the output and return it plainly.
+    """
+
+    output = pulumi.runtime.call(tok, props, res, typ)
+
+    # Ingoring deps silently. They are typically non-empty, r.f() calls include r as a dependency.
+    result, known, secret, _ = _sync_await(asyncio.ensure_future(_await_output(output)))
+
+    problem = None
+    if not known:
+        problem = ' an unknown value'
+    elif secret:
+        problem = ' a secret value'
+
+    if problem:
+        raise AssertionError(
+            f"Plain resource method '{tok}' incorrectly returned {problem}. "
+            + "This is an error in the provider, please report this to the provider developer."
+        )
+
+    return result
+
+
+async def _await_output(o: pulumi.Output[typing.Any]) -> typing.Tuple[object, bool, bool, set]:
+    return (
+        await o._future,
+        await o._is_known,
+        await o._is_secret,
+        await o._resources,
+    )
+
+
+# This is included to provide an upgrade path for users who are using a version
+# of the Pulumi SDK (<3.121.0) that does not include the `deprecated` decorator.
+def deprecated(message: str) -> typing.Callable[[C], C]:
+    """
+    Decorator to indicate a function is deprecated.
+
+    As well as inserting appropriate statements to indicate that the function is
+    deprecated, this decorator also tags the function with a special attribute
+    so that Pulumi code can detect that it is deprecated and react appropriately
+    in certain situations.
+
+    message is the deprecation message that should be printed if the function is called.
+    """
+
+    def decorator(fn: C) -> C:
+        if not callable(fn):
+            raise TypeError("Expected fn to be callable")
+
+        @functools.wraps(fn)
+        def deprecated_fn(*args, **kwargs):
+            warnings.warn(message)
+            pulumi.warn(f"{fn.__name__} is deprecated: {message}")
+
+            return fn(*args, **kwargs)
+
+        deprecated_fn.__dict__["_pulumi_deprecated_callable"] = fn
+        return typing.cast(C, deprecated_fn)
+
+    return decorator
+
+def get_plugin_download_url():
+	return None
+
+def get_version():
+     return _version_str