[issue46836] [C API] Move PyFrameObject to the internal C API

[STINNER Victor]

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

I marked my PR as a draft since this change is an incompatible change. Even if PyFrameObject structure is excluded from the limited C API and not documented, it's used by a few projects. I plan to check how this change impacts these projects before merging the change.

For example, test this change on:

* Cython: https://github.com/cython/cython/issues/4500
* gevent: https://github.com/gevent/gevent/issues/1867
* coverage uses f_lasti: https://bugs.python.org/issue40421#msg403814

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