[3.12] gh-99108: Release the GIL around hashlib built-in computation (GH-104675) #104776
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This matches the GIL releasing behavior of our existing
_hashopenssl
module, extending it to the HACL* built-ins.
Includes adding comments to better describe the ENTER/LEAVE macros
purpose and explain the lock strategy in both existing and new code.
(cherry picked from commit 2e5d8a9)
Co-authored-by: Gregory P. Smith greg@krypto.org