[Native] [Bug] rmqClient close

[xujianhai666]

BUG REPORT
Please add the branch name [Native]/[Master] at the header of the Isssue title.

1. Please describe the issue you observed:

   • What did you do (The steps to reproduce)?
     rmqClient use close bool to represent the current status, but there are many goroutines run for rmqClient, which means race condition, sometimes close will miss for some goroutine.
     we observe sometimes partitions are blocked without any consuming, we doubt close is the murderer.

   • What did you expect to see?
     close should be chan for really close.

   • What did you see instead?

2. Please tell us about your environment:

   • What is your OS?

   • What is your client version?

   • What is your RocketMQ version?

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