[ISSUE #103]SelectorType.TAG support placeholder

[Shellbye]

What is the purpose of the change

@RocketMQMessageListener support SelectorType.TAG placeholder

@Service
@RocketMQMessageListener(
        topic = "${mq.topic}",
        consumerGroup = "ConsumerGroup1",
        messageModel = MessageModel.BROADCASTING,
        selectorType = SelectorType.TAG,
        selectorExpression = "${mq.tag}"
)
public class Consumer implements RocketMQListener<String> {
    @Override
    public void onMessage(String message) {
        System.out.printf("\n\n\n------- Consumer received: %s \n\n\n\n", message);
    }
}

Brief changelog

org.apache.rocketmq.spring.support.DefaultRocketMQListenerContainer
private void initRocketMQPushConsumer()

Verifying this change

XXXX

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[RongtongJin]

There is a similar PR in the list.

[Shellbye]

There is a similar PR in the list.

The similar PR does not consider SelectorType.SQL92.

[Shellbye]

#103

[vongosling]

@Shellbye considering there was a similar problem earlier, could you help to clarify your pr purpose?

[RongtongJin]

I will temporarily close this PR, and please feel free to reopen it if you want to do more work with it.