message: fix(sdk-api): fix txValueLimit type
  type should be string to handle large precision
  Ticket:
diff: @@ -128,8 +128,8 @@ export interface TokenIssuance {
  export interface AccessTokenSpendingLimit {
  coin: string;
  txCount?: number;
  - txValue?: number;
  - txValueLimit?: number;
  + txValue?: string;
  + txValueLimit?: string;
  }
  export interface AddAccessTokenOptions {
  