Add `PyDict_AsFrozenDictAndClear` C-API

[sobolevn]

Feature or enhancement

Discussion: https://discuss.python.org/t/provide-a-c-api-to-efficently-convert-dict-into-frozendict/107754/10

Looks like that all agree that this API would be useful.
How it works?

1. We create a dict by any existing C-API functions for PyDict_*.
2. Then we call PyDict_AsFrozenDictAndClear which creates new frozendict instance from the existing dict with O(1) complexity
3. It clears the initial dict and it can be decrefed by the caller if needed

Linked PRs

• gh-153410: Add PyDict_AsFrozenDictAndClear C-API #153413