[issue21233] Add *Calloc functions to CPython memory allocation API

[STINNER Victor]

STINNER Victor added the comment:

"2) I'm not happy with the refactoring in bytearray_init(). (...)

3) Somewhat similarly, I wonder if it was necessary to refactor
   PyBytes_FromStringAndSize(). (...)"

Ok, I reverted the change on bytearray(int) and opened the issue #21644 to discuss these two optimizations.

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