[ISSUE #1122] support custom `asyncThreadPool`

[loongs-zhang]

see https://github.com/sofastack/sofa-rpc/issues/1122

[sofastack-bot[bot]]

Hi @dragon-zhang, welcome to SOFAStack community, Please sign Contributor License Agreement!

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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[bot]]

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%)	:arrow_down:
...m/alipay/sofa/rpc/module/FaultToleranceModule.java	63.63% <0.00%> (-31.82%)	:arrow_down:
...ofa/rpc/registry/consul/HealthServiceInformer.java	84.78% <0.00%> (-4.35%)	:arrow_down:
.../main/java/com/alipay/sofa/rpc/event/EventBus.java	78.43% <0.00%> (-1.97%)	:arrow_down:
.../alipay/sofa/rpc/metrics/lookout/RpcLookoutId.java	87.30% <0.00%> (-1.59%)	:arrow_down:
...om/alipay/sofa/rpc/metrics/lookout/RpcLookout.java	80.00% <0.00%> (-0.96%)	:arrow_down:
...n/java/com/alipay/sofa/rpc/common/SofaConfigs.java	86.79% <0.00%> (+1.88%)	:arrow_up:

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