code: private MethodCall<Object> transformBeforeMethodCall(MethodCall<Object> methodCall) {
          if (argTransformer == null || argTransformer == ServiceConstants.NO_OP_ARG_TRANSFORM) {
              return methodCall;
          }
          Object arg = this.argTransformer.transform(methodCall);
          return MethodCallBuilder.transformed(methodCall, arg);
      }
docs: Handles the before argument transformer.
  
  @param methodCall method call that we might transform
  @return method call