[issue43725] Create a release branch ABI stability regression test

[Gregory P. Smith]

Gregory P. Smith <greg at krypto.org> added the comment:

Indeed.  In particular given the 3.9.3 issue I was assuming such a test should include asserting both the sizeof() ABI structs and offsetof() public members of all ABI structs.  On each specific first class supported platform.

This goes beyond what https://www.python.org/dev/peps/pep-0652/#testing-the-stable-abi currently states to check size and layout rather than just symbol presence.  But seems to match the intent.

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