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Not an important update, but is required for Elements p2tr support whenever that is due.
Supersedes #8098 using the just minted wally release. Removes now-redundant serialized psbt copies, and enables signature hash caching for faster PSBT signing.
The code that creates signature hashes with transactions should be migrated to PSBT, it's kind of a mix currently and the APIs exposed/wally APIs used don't lend themselves to caching or taproot signing. Thats out of scope for this PR though.
Important
25.02 FREEZE JANUARY 31ST: Non-bugfix PRs not ready by this date will wait for 25.05.
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