[internal] Refactor TypeId, Key, and Value for rust-cpython FFI #13514
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This switches from several free functions in
externs/mod.rs
to instead implement methods onTypeId
,Key
, andValue
. That's more idiomatic.The new methods also tend to take
py: Python
now, rather than force-acquiring the GIL. This allows sharing the GIL across several function calls, which the PyO3 maintainers shared can be much more efficient to avoid overhead: #12451 (comment)Finally, this deduplicates when
Debug
andDisplay
had the same implementations.[ci skip-build-wheels]