CallbackServiceCodec method Name Camel-Case Fix #2973

[leihuazhe]

…mel-case fix issues #2973

What is the purpose of the change

Pull request for fix the issues for #2973

change CallbackServiceCodec which method referOrdestroyCallbackService Name to referOrDestroyCallbackService

Brief changelog

incubator-dubbo/dubbo-rpc/dubbo-rpc-dubbo/src/main/java/org/apache/dubbo/rpc/protocol/dubbo/CallbackServiceCodec.java

Verifying this change

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[leihuazhe]

take the pull request agin for fix issues #2973

[codecov-io]

Codecov Report

Merging #2979 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2979      +/-   ##
==========================================
+ Coverage   63.95%   63.98%   +0.02%     
==========================================
  Files         584      584              
  Lines       26059    26059              
  Branches     4562     4562              
==========================================
+ Hits        16666    16673       +7     
+ Misses       7217     7205      -12     
- Partials     2176     2181       +5

Impacted Files	Coverage Δ
...dubbo/rpc/protocol/dubbo/CallbackServiceCodec.java	79.41% <100%> (+2.2%)	⬆️
.../remoting/transport/netty4/NettyClientHandler.java	75% <0%> (-11.12%)	⬇️
...in/java/org/apache/dubbo/common/utils/JVMUtil.java	73.58% <0%> (-7.55%)	⬇️
.../apache/dubbo/remoting/transport/AbstractPeer.java	63.04% <0%> (-2.18%)	⬇️
...rg/apache/dubbo/common/timer/HashedWheelTimer.java	60.62% <0%> (-1.75%)	⬇️
...pache/dubbo/remoting/transport/AbstractServer.java	47.91% <0%> (-1.05%)	⬇️
.../java/org/apache/dubbo/config/ReferenceConfig.java	56.06% <0%> (+0.37%)	⬆️
...pache/dubbo/registry/support/AbstractRegistry.java	81.95% <0%> (+0.75%)	⬆️
...apache/dubbo/rpc/protocol/dubbo/DubboProtocol.java	66.66% <0%> (+0.83%)	⬆️
...dubbo/remoting/exchange/support/DefaultFuture.java	69.79% <0%> (+2.01%)	⬆️
... and 4 more

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[beiwei30]

LGTM.