[ISSUE #9196] Broker return pop stats when receive notification

[qianye1001]

Which Issue(s) This PR Fixes

Fixes #9196

Brief Description

How Did You Test This Change?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 22 lines in your changes missing coverage. Please review.

Project coverage is 48.03%. Comparing base (a275510) to head (c94ea10).
Report is 14 commits behind head on develop.

Files with missing lines	Patch %	Lines
.../apache/rocketmq/client/consumer/NotifyResult.java	0.00%	8 Missing ⚠️
.../rocketmq/client/impl/mqclient/MQClientAPIExt.java	0.00%	6 Missing ⚠️
...cketmq/broker/processor/NotificationProcessor.java	0.00%	4 Missing ⚠️
...ng/protocol/header/NotificationResponseHeader.java	0.00%	4 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #9197      +/-   ##
=============================================
+ Coverage      47.98%   48.03%   +0.04%     
- Complexity     12072    12089      +17     
=============================================
  Files           1321     1322       +1     
  Lines          93024    93049      +25     
  Branches       11926    11924       -2     
=============================================
+ Hits           44638    44694      +56     
+ Misses         42880    42830      -50     
- Partials        5506     5525      +19     

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[lizhimins]

这里我倒是建议用 Pair 去写，减少不必要的对象和阅读的复杂性