[ISSUE #8933] feat: DefaultPullConsumer add balance switch.

[humkum]

close #8933

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 12.50000% with 7 lines in your changes missing coverage. Please review.

Project coverage is 47.57%. Comparing base (797024f) to head (ea9a3e7).

Files with missing lines	Patch %	Lines
...lient/impl/consumer/DefaultMQPullConsumerImpl.java	0.00%	4 Missing ⚠️
...ocketmq/client/consumer/DefaultMQPullConsumer.java	25.00%	3 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #8934      +/-   ##
=============================================
+ Coverage      47.55%   47.57%   +0.01%     
- Complexity     11733    11734       +1     
=============================================
  Files           1304     1304              
  Lines          91058    91066       +8     
  Branches       11675    11677       +2     
=============================================
+ Hits           43303    43324      +21     
+ Misses         42405    42394      -11     
+ Partials        5350     5348       -2     

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