[Concept] Dynamic command for fastly building parser.

[elda27]

It becomes to separate function implementation and decleration.
An example code:

# main.py
@dynamic_command("mod.importing.dynamic:main")
def definition(config: Config):
    ....

---
# mod.importing.dynamic
def main(config:Config):
    # Implementation
    ...

A proposing approach can support no definition of the type annotation due to static analysis using ast parser.
But it implementation is hard to support precise behavior then dynamically inheritance or assignment.
So this library needs fully annotation at the function decorated by dynamic.

from pydantic import BaseModel
from pydantic_argify import command
from usermod import UnexpectedConfig
class Config(BaseModel):
    ...

Config = UnexpectedConfig

@command
def command(config: Config):
    ...