[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 can throw up the PoC branch as a draft PR after GH-24135 is merged. We can just close the PR if this is uninteresting or something we want to postpone.

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