Skip inject if cast is disabled and there's nothing to inject

[Olegt0rr]

If type casting disabled and the function being decorated has no objects for injection, we may not decorate the original function, returning the original one.

This behavior is convenient for implementing automatic function decoration (similar to how FastAPI does not require a separate decorator for Depends to work in handlers).

Discussion link (ru) - https://t.me/python_faststream/40815

[Lancetnik]

If you have some time and would like to help with this feature - you can easely add such functional by checking real_model object for dependencies something here: https://github.com/Lancetnik/FastDepends/blob/feat/optional-pydantic/fast_depends/use.py#L163

[Lancetnik]

You need to check model.dependencies and model.extra_dependencies fields