feature: client discovers raft nodes through the naming server

[funky-eyes]

• I have registered the PR changes.

Ⅰ. Describe what this PR did

Ⅱ. Does this pull request fix one issue?

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov]

Codecov Report

Attention: Patch coverage is 4.95050% with 96 lines in your changes missing coverage. Please review.

Project coverage is 51.46%. Comparing base (117e57a) to head (b13d369).
Report is 3 commits behind head on 2.x.

Files with missing lines	Patch %	Lines
.../namingserver/NamingserverRegistryServiceImpl.java	0.00%	74 Missing ⚠️
...rties/registry/RegistryNamingServerProperties.java	14.28%	12 Missing ⚠️
...ata/namingserver/filter/ConsoleRemotingFilter.java	0.00%	3 Missing ⚠️
...ache/seata/namingserver/manager/NamingManager.java	50.00%	1 Missing and 2 partials ⚠️
...scovery/registry/raft/RaftRegistryServiceImpl.java	0.00%	2 Missing ⚠️
...rg/apache/seata/server/filter/RaftGroupFilter.java	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x    #7183      +/-   ##
============================================
- Coverage     51.56%   51.46%   -0.10%     
- Complexity     6812     6814       +2     
============================================
  Files          1169     1169              
  Lines         41482    41562      +80     
  Branches       4851     4865      +14     
============================================
  Hits          21389    21389              
- Misses        18072    18148      +76     
- Partials       2021     2025       +4     

Files with missing lines	Coverage Δ
...ava/org/apache/seata/common/ConfigurationKeys.java	0.00% <ø> (ø)
...c/main/java/org/apache/seata/common/Constants.java	100.00% <ø> (ø)
...scovery/registry/raft/RaftRegistryServiceImpl.java	23.61% <0.00%> (-0.09%)	⬇️
...rg/apache/seata/server/filter/RaftGroupFilter.java	8.33% <0.00%> (-1.67%)	⬇️
...ata/namingserver/filter/ConsoleRemotingFilter.java	10.16% <0.00%> (-0.36%)	⬇️
...ache/seata/namingserver/manager/NamingManager.java	50.20% <50.00%> (-0.01%)	⬇️
...rties/registry/RegistryNamingServerProperties.java	22.58% <14.28%> (-6.84%)	⬇️
.../namingserver/NamingserverRegistryServiceImpl.java	0.00% <0.00%> (ø)

... and 3 files with indirect coverage changes

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[slievrly]

LGTM