[DUBBO-3137]: move more constants out of ConfigConstants

[beiwei30]

What is the purpose of the change

issue #3137: move more constants out of ConfigConstants

Brief changelog

XXXXX

Verifying this change

XXXXX

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[codecov-io]

Codecov Report

Merging #4092 into master will increase coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #4092      +/-   ##
============================================
+ Coverage     62.64%   62.67%   +0.03%     
+ Complexity      545      544       -1     
============================================
  Files           762      762              
  Lines         32752    32752              
  Branches       5162     5162              
============================================
+ Hits          20516    20526      +10     
+ Misses         9875     9868       -7     
+ Partials       2361     2358       -3

Impacted Files	Coverage Δ	Complexity Δ
...main/java/org/apache/dubbo/remoting/Constants.java	100% <ø> (ø)	0 <0> (ø)	⬇️
...dubbo/rpc/cluster/directory/AbstractDirectory.java	96.96% <ø> (ø)	0 <0> (ø)	⬇️
.../remoting/telnet/support/TelnetHandlerAdapter.java	52.27% <ø> (ø)	0 <0> (ø)	⬇️
.../dubbo/registry/integration/RegistryDirectory.java	80.3% <ø> (ø)	0 <0> (ø)	⬇️
...onfigcenter/consul/ConsulDynamicConfiguration.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...che/dubbo/registry/dubbo/DubboRegistryFactory.java	89.74% <ø> (ø)	6 <0> (ø)	⬇️
...in/java/org/apache/dubbo/config/ServiceConfig.java	58.2% <ø> (ø)	0 <0> (ø)	⬇️
...ubbo/registry/support/AbstractRegistryFactory.java	87.87% <ø> (ø)	0 <0> (ø)	⬇️
...n/java/org/apache/dubbo/config/ProtocolConfig.java	92.85% <ø> (ø)	0 <0> (ø)	⬇️
...gcenter/support/etcd/EtcdDynamicConfiguration.java	0% <ø> (ø)	0 <0> (ø)	⬇️
... and 18 more

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[CrazyHZM]

LGTM