Add PSBT creator, signer and finalizer roles for BIP-322 - #75
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Summary
Implement BIP-322's multi-party PSBT workflow, a creator builds an unsigned signing request, independent signers add partial signatures after detecting the request, and a finalizer assembles and encodes the result.
Rebased on #73
Changes
detect_bip322_psbtto check the detection properties.Bip322Psbtto carry the detected message and challenge for signers.create_bip322_psbtto build an unsigned PSBT with the message, UTXO, and script fields set.sign_bip322_psbt_inputto detect the request, adds a partial signature (or tap_key_sig for taproot) to the first input.finalize_bip322_psbtto assemble signatures per BIP174 and encodes as afulsignature.create_to_spendinto a script-basedcreate_to_spend_from_scriptso detection can reconstructto_spendfrom a scriptPubKey.Closes #74