feat(bitcoin): add taproot lock output method to Script

[w3irdrobot]

Summary

Adds Taproot scriptPubKey support for DLC output handling in node-dlc.

This PR adds a Script.p2trLock() helper for constructing P2TR output scripts and updates DLC funding transaction change output creation to preserve raw changeSpk scripts instead of assuming all change outputs are P2WPKH.

Changes

• Add Script.p2trLock() for OP_1 <x-only-pubkey> Taproot output scripts.
• Add Script.fromRaw() for parsing raw scriptPubKey bytes without a length prefix.
• Update BatchDlcTxBuilder to use raw changeSpk scripts directly.
• Add tests for:
  • Taproot scriptPubKey construction.
  • Raw Taproot script parsing.
  • Offer-side Taproot change output preservation.
  • Accept-side Taproot change output preservation.

Context

Previously, BatchDlcTxBuilder rebuilt change outputs with:

Script.p2wpkhLock(changeSpk.slice(2))

That only works for P2WPKH scripts and breaks for Taproot/P2TR scriptPubKeys. This is problematic when payout/liquidation addresses are Taproot and the same script is used as changeSpk.

This PR keeps DLC funding outputs unchanged as P2WSH multisig. It only makes provided output scripts round-trip correctly.

Validation

• yarn build
• yarn workspace @node-dlc/bitcoin test
• yarn workspace @node-dlc/core test -- --grep TxBuilder
• Pre-commit lint hook passed

[matthewjablack]

one small nit

other than that LGTM 🎉

[matthewjablack]

LGTM 🎉