message: fix(core): fix address validation for casper
  using account lib utils method to validate casper address
  stlx-2929
diff: @@ -91,8 +91,7 @@ export class Cspr extends BaseCoin {
  return Bluebird.resolve(true).asCallback(callback);
  }
  verifyAddress(params: VerifyAddressOptions): boolean {
  - // TODO: Implement when available on the SDK.
  - throw true;
  + return accountLib.Cspr.Utils.isValidAddress(params.address);
  }
  /**
  