[issue35134] Add a new Include/cpython/ subdirectory for the "CPython API" with implementation details

[Nicholas Sim]

Change by Nicholas Sim <nsim at posteo.net>:


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pull_requests: +23342
pull_request: https://github.com/python/cpython/pull/24561

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35134>
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