Followup of #10010, share proxy instance among References that have the same key.

[chickenlj]

related to #10012

[codecov-commenter]

Codecov Report

Merging #10017 (96b959c) into 3.0 (ec98ff3) will decrease coverage by 0.02%.
The diff coverage is 58.33%.

@@             Coverage Diff              @@
##                3.0   #10017      +/-   ##
============================================
- Coverage     65.75%   65.72%   -0.03%     
+ Complexity      320      319       -1     
============================================
  Files          1218     1218              
  Lines         53052    53061       +9     
  Branches       8037     8040       +3     
============================================
- Hits          34883    34874       -9     
- Misses        14368    14379      +11     
- Partials       3801     3808       +7     

Impacted Files	Coverage Δ
...g/apache/dubbo/config/AbstractInterfaceConfig.java	79.74% <33.33%> (-0.45%)	⬇️
...pache/dubbo/config/utils/SimpleReferenceCache.java	69.47% <66.66%> (+0.93%)	⬆️
.../remoting/transport/netty4/NettyServerHandler.java	62.79% <0.00%> (-9.31%)	⬇️
.../common/threadpool/serial/SerializingExecutor.java	70.37% <0.00%> (-7.41%)	⬇️
...bo/rpc/protocol/dubbo/DecodeableRpcInvocation.java	75.92% <0.00%> (-3.71%)	⬇️
.../dubbo/registry/client/metadata/MetadataUtils.java	61.90% <0.00%> (-3.58%)	⬇️
...he/dubbo/remoting/transport/netty/NettyServer.java	70.17% <0.00%> (-3.51%)	⬇️
.../apache/dubbo/remoting/transport/CodecSupport.java	80.30% <0.00%> (-3.04%)	⬇️
...bbo/common/resource/GlobalResourcesRepository.java	72.72% <0.00%> (-1.82%)	⬇️
...etadata/report/support/AbstractMetadataReport.java	67.71% <0.00%> (-1.80%)	⬇️
... and 9 more

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[chickenlj]

Reviewed by Albumen