optimize: Use shared EventLoop for TM and RM clients to reduce thre…

[YongGoose]

…ad overhead

• I have registered the PR changes.

Ⅰ. Describe what this PR did

Ⅱ. Does this pull request fix one issue?

fixes #6774

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov]

Codecov Report

Attention: Patch coverage is 57.89474% with 8 lines in your changes missing coverage. Please review.

Project coverage is 52.17%. Comparing base (c4b9b93) to head (9e6f46f).

Files with missing lines	Patch %	Lines
...che/seata/core/rpc/netty/NettyClientBootstrap.java	42.85%	6 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x    #7179      +/-   ##
============================================
- Coverage     52.17%   52.17%   -0.01%     
  Complexity     6817     6817              
============================================
  Files          1154     1154              
  Lines         41116    41128      +12     
  Branches       4820     4820              
============================================
+ Hits          21454    21457       +3     
- Misses        17624    17627       +3     
- Partials       2038     2044       +6     

Files with missing lines	Coverage Δ
...ava/org/apache/seata/common/ConfigurationKeys.java	0.00% <ø> (ø)
...in/java/org/apache/seata/common/DefaultValues.java	0.00% <ø> (ø)
...apache/seata/core/rpc/netty/NettyClientConfig.java	52.85% <100.00%> (+0.68%)	⬆️
.../autoconfigure/properties/TransportProperties.java	94.73% <100.00%> (+0.39%)	⬆️
...che/seata/core/rpc/netty/NettyClientBootstrap.java	55.20% <42.85%> (-2.10%)	⬇️

... and 4 files with indirect coverage changes