[ISSUE #1122] support custom asyncThreadPool

[loongs-zhang]

see #1122

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[loongs-zhang]

我明明签了CLA呀

[seeflood]

@dragon-zhang cla好啦，感谢贡献。

[loongs-zhang]

@dragon-zhang cla好啦，感谢贡献。

em...master的测试用例有些问题，这个PR只加了设置线程池的方法.

[codecov]

Codecov Report

Merging #1194 (b456939) into master (2f23db9) will decrease coverage by 0.07%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #1194      +/-   ##
============================================
- Coverage     71.58%   71.50%   -0.08%     
+ Complexity      830      827       -3     
============================================
  Files           408      408              
  Lines         17211    17213       +2     
  Branches       2682     2682              
============================================
- Hits          12320    12309      -11     
- Misses         3529     3540      +11     
- Partials       1362     1364       +2     

Impacted Files	Coverage Δ
...java/com/alipay/sofa/rpc/context/AsyncRuntime.java	78.57% <0.00%> (-6.05%)	⬇️
...m/alipay/sofa/rpc/module/FaultToleranceModule.java	63.63% <0.00%> (-31.82%)	⬇️
...ofa/rpc/registry/consul/HealthServiceInformer.java	84.78% <0.00%> (-4.35%)	⬇️
.../main/java/com/alipay/sofa/rpc/event/EventBus.java	78.43% <0.00%> (-1.97%)	⬇️
.../alipay/sofa/rpc/metrics/lookout/RpcLookoutId.java	87.30% <0.00%> (-1.59%)	⬇️
...om/alipay/sofa/rpc/metrics/lookout/RpcLookout.java	80.00% <0.00%> (-0.96%)	⬇️
...n/java/com/alipay/sofa/rpc/common/SofaConfigs.java	86.79% <0.00%> (+1.88%)	⬆️

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[JervyShi]

We need to consider a more reasonable configuration for supporting asynchronous thread pool setups. The changes here do not guarantee thread safety and do not ensure that no other logic will have access to the thread pool created by the original logic before the set method is called. I hope to have a modified solution to discuss before putting it into development.

[loongs-zhang]

We need to consider a more reasonable configuration for supporting asynchronous thread pool setups. The changes here do not guarantee thread safety and do not ensure that no other logic will have access to the thread pool created by the original logic before the set method is called. I hope to have a modified solution to discuss before putting it into development.

sorry, I will follow the steps.