[Dubbo-7054]消费者端Executor调整为“全局共享”、“按提供者隔离”2个可选模式

[zhangyz-hd]

What is the purpose of the change

这是在 #7109 基础上进一步将消费者端Executor调整为“全局共享”、“按提供者隔离”2个可选模式，默认工作在全局共享，可以通过dubbo:consumer的share.threadpool进行设置。

<dubbo:consumer>
    <dubbo:parameter key="share.threadpool" value="false"/>
</dubbo:consumer>

备注：share.threadpool参数命名沿用自2.6.9

Brief changelog

1. 如果share.threadpool=true，DefaultExecutorRepository在createExecutor时返回包装后的ShareableExecutor。
2. AbstractClient在close时，如果executor为ShareableExecutor这不处理executor.shutdown。

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[codecov-io]

Codecov Report

Merging #7120 (691e02c) into master (bd43fa7) will decrease coverage by 0.33%.
The diff coverage is 75.55%.

@@             Coverage Diff              @@
##             master    #7120      +/-   ##
============================================
- Coverage     60.07%   59.74%   -0.34%     
+ Complexity      506      288     -218     
============================================
  Files          1028     1002      -26     
  Lines         41531    39982    -1549     
  Branches       6038     5934     -104     
============================================
- Hits          24951    23886    -1065     
+ Misses        13813    13370     -443     
+ Partials       2767     2726      -41     

Impacted Files	Coverage Δ	Complexity Δ
...apache/dubbo/common/constants/CommonConstants.java	100.00% <ø> (ø)	0.00 <0.00> (ø)
...pache/dubbo/remoting/transport/AbstractClient.java	61.74% <16.66%> (-1.27%)	0.00 <0.00> (ø)
.../threadpool/manager/DefaultExecutorRepository.java	83.58% <83.33%> (-4.56%)	0.00 <0.00> (ø)
...che/dubbo/common/threadpool/ShareableExecutor.java	81.81% <85.71%> (ø)	0.00 <0.00> (?)
.../apache/dubbo/config/bootstrap/DubboBootstrap.java	41.97% <100.00%> (-0.06%)	0.00 <0.00> (ø)
...che/dubbo/common/utils/CharSequenceComparator.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (ø%)
...che/dubbo/rpc/cluster/support/FailfastCluster.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (ø%)
...bo/rpc/cluster/interceptor/ClusterInterceptor.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (ø%)
...java/org/apache/dubbo/remoting/etcd/Constants.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (ø%)
...pache/dubbo/metadata/report/support/Constants.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (ø%)
... and 139 more

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[chickenlj]

duplicat of #7109