[ISSUE #8720] Support disable netty server worker group by config

[lizhimins]

Which Issue(s) This PR Fixes

Fixes #8720

Brief Description

How Did You Test This Change?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 33.33333% with 4 lines in your changes missing coverage. Please review.

Project coverage is 47.44%. Comparing base (cab4fda) to head (267bc8d).

Files with missing lines	Patch %	Lines
...e/rocketmq/remoting/netty/NettyRemotingServer.java	0.00%	0 Missing and 2 partials ⚠️
...che/rocketmq/remoting/netty/NettyServerConfig.java	50.00%	2 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #8721      +/-   ##
=============================================
- Coverage      47.48%   47.44%   -0.04%     
+ Complexity     11536    11535       -1     
=============================================
  Files           1279     1279              
  Lines          89558    89562       +4     
  Branches       11514    11516       +2     
=============================================
- Hits           42525    42492      -33     
- Misses         41807    41844      +37     
  Partials        5226     5226              

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[fuyou001]

Waiting for code review

[fuyou001]

LGTM