[Taproot API Project] replace `TaprootSpendInfo` with new miniscript-specific structure#815

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apoelstra wants to merge 7 commits intorust-bitcoin:masterfrom

apoelstra:2025-03--taproot-api

Commits on May 2, 2025

descriptor: add unit test from sanket
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psbt: untangle some logic in `update_item_with_descriptor_helper`
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tr: introduce new `TrSpendInfo` structure which holds a full TapTree
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tr: replace `bitcoin::TaprootSpendInfo` with `TrSpendInfo`, update psbt
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tr: add conversion from TrSpendInfo to bitcoin::TapTree
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tr: add a whole bunch of fixed vector unit tests for TrSpendInfo
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fuzz: update taptree regression test to also check control blocks
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