[issue42862] Use functools.lru_cache iso. _sqlite.Cache in sqlite3 module

[Erlend Egeberg Aasland]

Erlend Egeberg Aasland <erlend.aasland at innova.no> added the comment:

> I don't see any reason to merge GH-24135 if we are going to remove cache.[ch] in this issue.

Yes, I've thought about that myself. A small argument pro merging GH-24135 would be that if we for some reason decide to revert this change, then cache.[ch] would still be prepared for module state (which is needed for multi-phase init).

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