[master] close client immediately when destroy unused invoker

[zrlw]

What is the purpose of the change

fix #8752 #8748 #6404 on master

[codecov-commenter]

Codecov Report

Merging #8756 (a21557f) into master (abb2109) will decrease coverage by 0.70%.
The diff coverage is 45.00%.

@@             Coverage Diff              @@
##             master    #8756      +/-   ##
============================================
- Coverage     61.04%   60.33%   -0.71%     
+ Complexity      448      446       -2     
============================================
  Files          1097     1099       +2     
  Lines         44383    44350      -33     
  Branches       6460     6429      -31     
============================================
- Hits          27093    26759     -334     
- Misses        14309    14622     +313     
+ Partials       2981     2969      -12     

Impacted Files	Coverage Δ
...stry/client/ServiceDiscoveryRegistryDirectory.java	13.52% <0.00%> (ø)
...apache/dubbo/remoting/exchange/ExchangeClient.java	0.00% <0.00%> (ø)
...c/protocol/dubbo/ReferenceCountExchangeClient.java	63.33% <40.00%> (-2.74%)	⬇️
.../apache/dubbo/rpc/protocol/dubbo/DubboInvoker.java	70.42% <42.85%> (-3.43%)	⬇️
.../dubbo/registry/integration/RegistryDirectory.java	76.17% <100.00%> (ø)
...pi/src/main/java/org/apache/dubbo/rpc/Invoker.java	100.00% <100.00%> (ø)
...gcenter/wrapper/CompositeDynamicConfiguration.java	0.00% <0.00%> (-73.34%)	⬇️
...ookeeper/ZookeeperDynamicConfigurationFactory.java	0.00% <0.00%> (-66.67%)	⬇️
...pport/zookeeper/ZookeeperDynamicConfiguration.java	0.00% <0.00%> (-62.86%)	⬇️
...fig/configcenter/TreePathDynamicConfiguration.java	31.42% <0.00%> (-54.29%)	⬇️
... and 63 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update abb2109...a21557f. Read the comment docs.