add vendored yyjson as default json parser

src/tests/thirdparty/t_yyjson_smoke.cpp

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+// Copyright (c) Lawrence Livermore National Security, LLC and other Conduit
+// Project developers. See top-level LICENSE AND COPYRIGHT files for dates and
+// other details. No copyright assignment is required to contribute to Conduit.
+
+//-----------------------------------------------------------------------------
+///
+/// file: t_yyjson_smoke.cpp
+///
+//-----------------------------------------------------------------------------
+
+#include "conduit_yyjson.h"
+#include "gtest/gtest.h"
+
+using namespace conduit_yyjson;
+
+//-----------------------------------------------------------------------------
+TEST(yyjson_smoke, basic_use)
+{
+    const char json[] = "{ \"hello\" : \"world\" }";
+    yyjson_doc *doc = yyjson_read(json, strlen(json), 0);
+    yyjson_val *root = yyjson_doc_get_root(doc);
+    yyjson_val *name = yyjson_obj_get(root, "hello");
+    ASSERT_STREQ(yyjson_get_str(name),"world");
+    yyjson_doc_free(doc);
+}

src/thirdparty_builtin/yyjson/CMakeLists.txt

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+# Copyright (c) Lawrence Livermore National Security, LLC and other Conduit
+# Project developers. See top-level LICENSE AND COPYRIGHT files for dates and
+# other details. No copyright assignment is required to contribute to Conduit.
+
+################################
+# Simple CMake setup for yyjson
+################################
+
+#
+# yyjson sources
+#
+
+set(yyjson_sources
+    conduit_yyjson.cpp
+    )
+
+#
+# yyjson headers
+#
+
+set(yyjson_headers
+    conduit_yyjson_interface.h
+    conduit_yyjson.h)
+
+include_directories(${CMAKE_CURRENT_SOURCE_DIR})
+
+add_compiled_library(NAME conduit_yyjson
+                     OBJECT
+                     SOURCES ${yyjson_sources}
+                     HEADERS ${yyjson_headers}
+                     FOLDER thirdparty_builtin)
+

src/thirdparty_builtin/yyjson/LICENSE

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+MIT License
+
+Copyright (c) 2020 YaoYuan <[email protected]>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

src/thirdparty_builtin/yyjson/conduit_readme.txt

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+This is a subset of yyson from the 0.10.0 release (July 2024)
+
+https://github.com/ibireme/yyjson/
+
+License: MIT
+
+We use internally - the build system parts, tests, etc were removed since they are not used.
+
+Added header (conduit_yyjson_interface.h) as an interface.
+
+Added a namespace (conduit_yyson) to avoid potential symbol collisions with others embedding yyjson.
+