[Dubbo-3744]Create constants for 'hash.names' and 'hash.arguments' (#3744)

[danielamorais]

What is the purpose of the change

fix #3744

Brief changelog

XXXXX

Verifying this change

XXXXX

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[ralf0131]

LGTM, thanks for the pull request. Please merge it if the UT passed.

[codecov-io]

Codecov Report

Merging #3758 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #3758      +/-   ##
============================================
- Coverage     63.59%   63.59%   -0.01%     
  Complexity       71       71              
============================================
  Files           704      704              
  Lines         31069    31063       -6     
  Branches       5037     5037              
============================================
- Hits          19757    19753       -4     
  Misses         9037     9037              
+ Partials       2275     2273       -2

Impacted Files	Coverage Δ	Complexity Δ
...c/main/java/org/apache/dubbo/common/Constants.java	93.33% <ø> (ø)	0 <0> (ø)	⬇️
...cluster/loadbalance/ConsistentHashLoadBalance.java	87.75% <100%> (ø)	0 <0> (ø)	⬇️
...ache/dubbo/remoting/p2p/support/AbstractGroup.java	45.45% <0%> (-11.37%)	0% <0%> (ø)
...he/dubbo/qos/server/handler/QosProcessHandler.java	55.88% <0%> (-1.27%)	0% <0%> (ø)
...ting/exchange/support/header/HeartbeatHandler.java	83.72% <0%> (-0.73%)	0% <0%> (ø)
...exchange/support/header/HeaderExchangeHandler.java	62.2% <0%> (-0.59%)	0% <0%> (ø)
...rpc/cluster/loadbalance/RoundRobinLoadBalance.java	79.68% <0%> (-0.32%)	0% <0%> (ø)
.../apache/dubbo/remoting/transport/AbstractPeer.java	63.04% <0%> (ø)	0% <0%> (ø)	⬇️
...dubbo/remoting/exchange/support/DefaultFuture.java	75.51% <0%> (+0.68%)	0% <0%> (ø)	⬇️
.../exchange/support/header/HeaderExchangeServer.java	67.92% <0%> (+0.94%)	0% <0%> (ø)	⬇️
... and 2 more

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