[issue39573] [C API] Make PyObject an opaque structure in the limited C API

[Zackery Spytz]

Change by Zackery Spytz <zspytz at gmail.com>:


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nosy: +ZackerySpytz
nosy_count: 8.0 -> 9.0
pull_requests: +19294
pull_request: https://github.com/python/cpython/pull/19975

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39573>
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