message: fix(core): change type of `sequenceId` to string
  This parameter is a free-form string and not a number.
  Ticket:
diff: @@ -81,7 +81,7 @@ export interface PrebuildTransactionOptions {
  targetWalletUnspents?: number;
  minValue?: number;
  maxValue?: number;
  - sequenceId?: number;
  + sequenceId?: string;
  lastLedgerSequence?: number;
  ledgerSequenceDelta?: string;
  gasPrice?: number;
  @@ -366,7 +366,7 @@ export interface SendManyOptions {
  message?: string;
  minValue?: number;
  maxValue?: number;
  - sequenceId?: number;
  + sequenceId?: string;
  lastLedgerSequence?: number;
  ledgerSequenceDelta?: string;
  gasPrice?: number;
  