feat: support mpt_utility APIs for key rotation

[yinyiqian1]

Add API layer for rippled and other downstream consumer to call, also added context hash for each tx/mode:

Hash = SHA-512Half(TransactionType ‖ Account ‖ MPTokenIssuanceID ‖ Sequence ‖ Counterparty ‖ Version)
(For transactions that do not need to bind to a balance, Version = 0)

• ConfidentialMPTMirrorUpdate

  • Issuer mode:
    • mpt_get_issuer_mirror_update_proof / mpt_verify_issuer_mirror_update_proof (128 bytes)
    • context hash = ConfidentialMPTMirrorUpdate || issuer || MPTokenIssuanceID || seq || holder || 0
  • Holder mode:
    • mpt_get_holder_mirror_update_proof / mpt_verify_holder_mirror_update_proof (128 bytes)
    • context hash = ConfidentialMPTMirrorUpdate || holder || MPTokenIssuanceID || seq || holder || holder's ConfidentialBalanceVersion

• ConfidentialMPTHolderKeyUpdate

  • Rotation (tfHolderKeyRotation):
    • mpt_get_holder_key_rotation_proof / mpt_verify_holder_key_rotation_proof (224 bytes)
    • context hash = ConfidentialMPTHolderKeyUpdate || holder || MPTokenIssuanceID || seq || holder || holder's ConfidentialBalanceVersion
  • Recovery (tfHolderKeyRecovery):
    • mpt_get_holder_key_recovery_proof / mpt_verify_holder_key_recovery_proof (64 bytes)
    • context hash = ConfidentialMPTHolderKeyUpdate || holder || MPTokenIssuanceID || seq || holder || 0
  • Cancel (tfCancelRecovery): No proof required

• ConfidentialMPTRecoverBalance

  • mpt_get_recover_balance_proof / mpt_verify_recover_balance_proof (128 bytes)
  • context hash = ConfidentialMPTRecoverBalance || issuer || MPTokenIssuanceID || seq || holder || 0

Also updated the CXX standard to 17 because some of the cpp functions need the newer version.