[FEATURE] Add __all__ to fastapi

Is your feature request related to a problem

We use mypy with the option implicit_reexport = False. This triggers on idiomatic fastapi imports because fastapi/__init__.py reexports everything without declaring any in __all__

The solution you would like

Add a __all__ for all types that should be imported from the main module.

Describe alternatives you’ve considered

Direct imports from the respective submodules is a workaround but all examples assume an import from the main package

Additional context

https://mypy.readthedocs.io/en/stable/command_line.html#cmdoption-mypy-no-implicit-reexport

[hmvp]

Yeah currently we use direct imports from the place where they are defined (because mypy complains otheriwise). I don’t think there is anything wrong with that, but since the docs mostly use examples that import from main, I think __all__ should match canonical usage…

[github-actions[bot]]

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