Move all CPython API to py crate

[Bobronium]

No description provided.

[codspeed-hq]

Merging this PR will not alter performance

✅ 358 untouched benchmarks

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_{Comparing abstract-cpython-api (d5ca0f0) with main (633b621)¹}

Footnotes

1. No successful run was found on main (0c1d1c8) during the generation of this report, so 633b621 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩