Optimize some code of the dubbo metadata module

[wangchengming666]

Optimize some code of the dubbo metadata module

[codecov-commenter]

Codecov Report

Merging #8783 (673bc4d) into 3.0 (675aead) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##                3.0    #8783      +/-   ##
============================================
+ Coverage     63.89%   63.91%   +0.01%     
+ Complexity      313      312       -1     
============================================
  Files          1151     1151              
  Lines         48381    48381              
  Branches       7294     7294              
============================================
+ Hits          30914    30921       +7     
+ Misses        14088    14084       -4     
+ Partials       3379     3376       -3     

Impacted Files	Coverage Δ
...pache/dubbo/metadata/report/support/Constants.java	100.00% <ø> (ø)
...etadata/report/support/AbstractMetadataReport.java	62.67% <100.00%> (ø)
...in/java/org/apache/dubbo/common/utils/JVMUtil.java	81.13% <0.00%> (-11.33%)	⬇️
...e/dubbo/remoting/transport/netty/NettyChannel.java	55.68% <0.00%> (-4.55%)	⬇️
...ng/transport/dispatcher/WrappedChannelHandler.java	63.04% <0.00%> (-4.35%)	⬇️
...dubbo/remoting/exchange/support/DefaultFuture.java	93.69% <0.00%> (+0.90%)	⬆️
...vent/listener/ServiceInstancesChangedListener.java	80.28% <0.00%> (+0.96%)	⬆️
...pache/dubbo/remoting/transport/AbstractServer.java	62.85% <0.00%> (+1.42%)	⬆️
...pache/dubbo/registry/support/AbstractRegistry.java	79.56% <0.00%> (+1.45%)	⬆️
.../dubbo/remoting/transport/netty4/NettyChannel.java	66.33% <0.00%> (+1.98%)	⬆️
... and 4 more

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