[issue40421] [C API] Add getter functions for PyFrameObject and maybe move PyFrameObject to the internal C API

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

The gevent project is not compatible with Python 3.11: it gets and sets directly PyFrameObject.f_code member which has been removed in Python 3.11 (moved to PyFrameObject.f_frame.f_code internal C API).

gevent issue: https://github.com/gevent/gevent/issues/1867

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