[Dubbo-7054]: Consumer thread pool create too many threads.#7054

[stonelion]

What is the purpose of the change

现象：
当 provider 意外宕机时（例如，kill -9 ），会触发 org.apache.dubbo.common.threadpool.manager.DefaultExecutorRepository#getExecutor。
由于 executor 先被关闭认为没有可用的线程池，重新使用默认的 fixed 线程池创建。多次触发后，会导致进程使用的线程过多。

原因：

1. executor 先被关闭：
   

2. inactive 回调：
   

3. 线程池覆盖
   

Brief changelog

增加 consumer 默认配置：
ThreadPool：cached
ThreadName: DubboClientHandler

Verifying this change

XXXXX

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[codecov-io]

Codecov Report

Merging #7044 (766e122) into master (47fa631) will decrease coverage by 0.09%.
The diff coverage is 88.88%.

@@             Coverage Diff              @@
##             master    #7044      +/-   ##
============================================
- Coverage     59.31%   59.22%   -0.10%     
- Complexity      508      509       +1     
============================================
  Files          1028     1028              
  Lines         41527    41529       +2     
  Branches       6038     6036       -2     
============================================
- Hits          24631    24594      -37     
- Misses        14141    14174      +33     
- Partials       2755     2761       +6     

Impacted Files	Coverage Δ	Complexity Δ
...apache/dubbo/common/constants/CommonConstants.java	100.00% <ø> (ø)	0.00 <0.00> (ø)
...ubbo/remoting/transport/grizzly/GrizzlyClient.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
.../threadpool/manager/DefaultExecutorRepository.java	62.50% <100.00%> (-1.91%)	0.00 <0.00> (ø)
...n/java/org/apache/dubbo/config/ConsumerConfig.java	94.11% <100.00%> (+1.01%)	0.00 <0.00> (ø)
...pache/dubbo/remoting/transport/AbstractClient.java	64.38% <100.00%> (ø)	0.00 <0.00> (ø)
...ng/transport/dispatcher/WrappedChannelHandler.java	47.82% <0.00%> (-15.22%)	0.00% <0.00%> (ø%)
...he/dubbo/common/threadpool/ThreadlessExecutor.java	52.17% <0.00%> (-10.87%)	0.00% <0.00%> (ø%)
.../apache/dubbo/rpc/protocol/AsyncToSyncInvoker.java	62.06% <0.00%> (-10.35%)	0.00% <0.00%> (ø%)
...ng/transport/dispatcher/all/AllChannelHandler.java	68.96% <0.00%> (-10.35%)	0.00% <0.00%> (ø%)
...mmon/threadpool/support/AbortPolicyWithReport.java	85.00% <0.00%> (-5.00%)	0.00% <0.00%> (ø%)
... and 11 more

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[chickenlj]

Hi, @stonelion many thanks to you for having raised this issue. It's been fixed by #7109, please help to check it works as expected.

Please let us know if there's any problem with the patch.