@Override
    public LocalTransactionState checkLocalTransaction(MessageExt messageExt) {
        return null;
    }
Note: This is a nagitive testing. It aims to tell user the fact that
the @RocketMQTransactionListener can not be used on consumer side!!!

<p>How to try it? just uncomment the annotation declaration, then compile
and run the consumer, it will fail to start.
rocketmq-spring-boot-samples/rocketmq-consume-demo/src/main/java/org/apache/rocketmq/samples/springboot/consumer/Checker.java