bark-rest: add bip321 builder endpoint

AcidBunny21requested to merge
barkd-bip321-builder into master
  • check or remove this line after you've added a CHANGELOG entry or if your PR doesn't need one (they should go into CHANGELOG/unreleased/)

Summary by CodeRabbit

  • New Features

    • Added support for generating BIP-321 payment URIs through the wallet API.
    • Payment URIs can now include an amount, label, message, and optional on-chain destination.
    • Added an uppercase URI option for QR-code friendly output when compatible.

  • Bug Fixes

    • Improved URI handling so optional payment details are included only when needed, reducing empty or unnecessary fields in responses.
Edited by coderabbit

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