bpo-45150: draft implementation only for sha224,sha256

[SonOfLilit]

This is only a draft, after review I will write similar code for all other internal hash implementations, as well as for OpenSSL-based implementations.

https://bugs.python.org/issue45150

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[gpshead]

I do not think we should be writing C code for the initial implementation of this feature. I like where #31930 is headed.

[arhadthedev]

Superseded by gh-31930.