[DUBBO-3137]: step4 - move more constants from RemotingConstants into dubbo-remoting-api

[beiwei30]

What is the purpose of the change

issue #3137: step4 - move more constants from RemotingConstants into dubbo-remoting-api

Brief changelog

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Verifying this change

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[codecov-io]

Codecov Report

Merging #4077 into master will increase coverage by <.01%.
The diff coverage is 75.89%.

@@             Coverage Diff             @@
##             master   #4077      +/-   ##
===========================================
+ Coverage     62.99%     63%   +<.01%     
  Complexity      544     544              
===========================================
  Files           756     756              
  Lines         32578   32578              
  Branches       5163    5163              
===========================================
+ Hits          20523   20525       +2     
+ Misses         9694    9693       -1     
+ Partials       2361    2360       -1

Impacted Files	Coverage Δ	Complexity Δ
...che/dubbo/registry/dubbo/DubboRegistryFactory.java	89.74% <ø> (ø)	6 <0> (ø)	⬇️
...src/main/java/org/apache/dubbo/remoting/Codec.java	100% <ø> (ø)	0 <0> (ø)	⬇️
...pache/dubbo/monitor/dubbo/DubboMonitorFactory.java	100% <ø> (ø)	6 <0> (ø)	⬇️
...rc/main/java/org/apache/dubbo/remoting/Codec2.java	100% <ø> (ø)	0 <0> (ø)	⬇️
...he/dubbo/remoting/transport/netty/NettyClient.java	66.1% <ø> (ø)	11 <0> (ø)	⬇️
...java/org/apache/dubbo/remoting/etcd/Constants.java	100% <ø> (ø)	0 <0> (ø)	⬇️
...g/apache/dubbo/config/AbstractReferenceConfig.java	94% <ø> (ø)	0 <0> (ø)	⬇️
...e/dubbo/registry/integration/RegistryProtocol.java	82.69% <ø> (ø)	0 <0> (ø)	⬇️
...ache/dubbo/remoting/transport/mina/MinaServer.java	63.33% <ø> (ø)	6 <0> (ø)	⬇️
.../apache/dubbo/remoting/p2p/support/ServerPeer.java	21.27% <0%> (ø)	0 <0> (ø)	⬇️
... and 58 more

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[CrazyHZM]

LGTM