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Merge bitcoindevkit/bdk#1424: Remove trait ComputeSighash

55a17293a ref(signer): Use `Psbt::sighash_ecdsa` for computing sighashes (valued mammal)
f2a2dae84 refactor(signer): Remove trait ComputeSighash (valued mammal)

Pull request description:

  This PR does some cleanup of the `bdk_wallet` signer module most notably by removing the internal trait `ComputeSighash` and replacing old code for computing the sighash (for legacy and segwit context) with a single method [`Psbt::sighash_ecdsa`](https://docs.rs/bitcoin/0.31.2/bitcoin/psbt/struct.Psbt.html#method.sighash_ecdsa). The logic for computing the taproot sighash is unchanged and extracted to a new helper function `compute_tap_sighash`.

  - [x] Unimplement `ComputeSighash`
  - [x] Try de-duplicating code by using `Psbt::sighash_ecdsa`. see https://github.com/bitcoindevkit/bdk/pull/1023#discussion_r1263140218
  - Not done in this PR: Consider removing unused `SignerError` variants

  fixes #1038

  ### Notes to the reviewers

  ### Changelog notice

  ### Checklists

  #### All Submissions:

  * [x] I've signed all my commits
  * [x] I followed the [contribution guidelines](https://github.com/bitcoindevkit/bdk/blob/master/CONTRIBUTING.md)
  * [x] I ran `cargo fmt` and `cargo clippy` before committing

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