[Python] Add an option to generate `.pyi` stubs and a `flatc` flag that controls the new behaviour.

google / flatbuffers

FlatBuffers: Memory Efficient Serialization Library

https://flatbuffers.dev/

Apache License 2.0

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Closed anton-bobukh closed 2 months ago

anton-bobukh commented 2 months ago

This change introduces two new flatc flags for Python:

--python-version that specifies the target Python version that can be:
- 2.x.x for Python2;
- 3.x.x for Python3;
- 0 for both Python2 and Python3.
--python-gen-stubs that controls the generation of .pyi stub files that are used by pytype.