Push Consumer goroutine leak.

[lampnick]

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Please ensure that your bug report is clear and that it is complete. Otherwise, we may be unable to understand it or to reproduce it, either of which would prevent us from fixing the bug. We strongly recommend the report(bug report or feature request) could include some hints as to the following:

BUG REPORT

1. Please describe the issue you observed:
   When topic not exists. The start method return error message, but not close goroutine.

for i := 0; i <= 100; i++ {
		opts := []consumer.Option{
			consumer.WithGroupName(normalGroup),
			consumer.WithInstance(namespace),
			consumer.WithMaxReconsumeTimes(5),               //消息最大重试消费次数
			consumer.WithPullBatchSize(1),                   //批量拉取时最大拉取数
			consumer.WithConsumeMessageBatchMaxSize(int(1)), //批量消费最大推送数量
			consumer.WithNamespace(namespace),
			consumer.WithNsResolver(primitive.NewPassthroughResolver([]string{tcpEp})),
			consumer.WithCredentials(primitive.Credentials{
				AccessKey: accessKey,
				SecretKey: secretKey,
			}),
		}

		c, err := rocketMQ.NewPushConsumer(
			opts...,
		)
		if err != nil {
			log.Fatalln("rocketMQ.NewPushConsumer err: ", err)
		}

		selector := consumer.MessageSelector{Type: consumer.TAG, Expression: normalTag}
		if err = c.Subscribe(topic, selector, normalMsgHandler()); err != nil {
			log.Fatalln("rocketMQ.Subscribe err: ", err)
		}

		if err = c.Start(); err != nil {
			log.Println("rocketMQ.Start err: ", err)
			continue
		}
		if err = c.Shutdown(); err != nil {
			log.Fatalln("rocketMQ.Shutdown err: ", err)
		}
	}

using pprof can see the leak of goroutine.

101 @ 0x103c505 0x104d357 0x138e43a 0x1072721
#	0x138e439	git.myscrm.cn/golang/rocketmq-client-go/v2/consumer.(*pushConsumer).Start.func1.1+0xd9	/Users/nick/gomod/test/vendor/git.myscrm.cn/golang/rocketmq-client-go/v2/consumer/push_consumer.go:154

2. Please tell us about your environment:

   • What is your OS?
     mac
   • What is your client version?
     v2.1.0
   • What is your RocketMQ version?

3. Other information (e.g. detailed explanation, logs, related issues, suggestions on how to fix, etc):

FEATURE REQUEST

1. Please describe the feature you are requesting.

2. Provide any additional detail on your proposed use case for this feature.

3. Indicate the importance of this issue to you (blocker, must-have, should-have, nice-to-have). Are you currently using any workarounds to address this issue?

4. If there are some sub-tasks using -[] for each subtask and create a corresponding issue to map to the sub task:

   • sub-task1-issue-number: sub-task1 description here,
   • sub-task2-issue-number: sub-task2 description here,
   • ...