Make it easier for users to extend ClientRPCServiceImpl to export more rpc services

[JackieTien97]

Make it easier for users to extend ClientRPCServiceImpl to export more rpc services.

After being merged, others only need to extend ClientRPCServiceImpl and then implement customized rpc interfaces and then override protected String getClientRPCServiceImplClassName()

[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.

Project coverage is 39.11%. Comparing base (a70575f) to head (a8c64fa).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
...ain/java/org/apache/iotdb/db/service/DataNode.java	0.00%	5 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #15589      +/-   ##
============================================
- Coverage     39.21%   39.11%   -0.11%     
  Complexity      198      198              
============================================
  Files          4710     4735      +25     
  Lines        306093   306988     +895     
  Branches      38285    38420     +135     
============================================
+ Hits         120048   120082      +34     
- Misses       186045   186906     +861     

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