feat: add retain_attestations API and CLI purge command for removing stale pending attestations#65

lightsing merged 9 commits intodev/m2lightsing/uts:dev/m2from

copilot/add-method-to-purge-pending-attestationlightsing/uts:copilot/add-method-to-purge-pending-attestationCopy head branch name to clipboard