feat(sdk-coin-canton): add participant allow-list command builders

[ravibitgo]

Summary

Add typed BitGoJS/account-lib helpers for constructing DTCC Canton v3 participant allow-list commands.

Changes

• Add CantonAllowListCommandParams.
• Add CantonCommandBuilder.addWalletsToAllowList().
• Add CantonCommandBuilder.removeWalletsFromAllowList().
• Build the exact V3 Canton choices:
  • ParticipantService_AddWalletsToAllowList
  • ParticipantService_RemoveWalletsFromAllowList
• Construct ExerciseCommand payloads using:
  • the ParticipantService template ID;
  • the ParticipantService contract CID;
  • the participant-owned allow-list CID;
  • end-investor credential CIDs.
• Validate template, ParticipantService, and allow-list contract identifiers.
• Reject empty or duplicate credential IDs.
• Preserve the DAR-supported empty credential-list no-op behavior.
• Keep the existing generic CantonCommand transaction type and signing flow unchanged.

Testing

• Canton command builder tests: 367 passing.
• Added coverage for:
  • add command construction;
  • remove command construction;
  • empty credential-list behavior;
  • duplicate credential rejection;
  • missing contract identifier rejection.
• Prettier check passes.

The full package build currently reaches unrelated existing sdk-core VRF/MPC type and API errors outside this change.

Ticket: CHALO-1850

[linear-code]

CHALO-1850

[github-actions]

⚠️ Unit tests are failing on Node 26.x (Current release line, non-blocking). This is not an LTS version yet, so it does not block merge, but it signals an incompatibility to fix before Node 26.x becomes LTS.

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