[issue46906] Add PyFloat_(Pack|Unpack)(2|4|8) to the public C API

[STINNER Victor]

Change by STINNER Victor <vstinner at python.org>:


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pull_requests: +29964
pull_request: https://github.com/python/cpython/pull/31866

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46906>
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