[To dev/1.3] Add HashLedaerBalancer

[jt2594838]

Add a LeaderBalancer that is mainly for test purposes.

[sonarqubecloud]

Quality Gate passed

Issues
0 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

❌ Patch coverage is 0% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 40.97%. Comparing base (b17a2c9) to head (08f4967).
⚠️ Report is 2 commits behind head on dev/1.3.

Files with missing lines	Patch %	Lines
...oad/balancer/router/leader/HashLeaderBalancer.java	0.00%	17 Missing ⚠️
...he/iotdb/confignode/conf/ConfigNodeDescriptor.java	0.00%	2 Missing ⚠️
.../iotdb/confignode/conf/ConfigNodeStartupCheck.java	0.00%	2 Missing ⚠️
...onfignode/manager/load/balancer/RouteBalancer.java	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             dev/1.3   #16654   +/-   ##
==========================================
  Coverage      40.96%   40.97%           
  Complexity       198      198           
==========================================
  Files           3582     3583    +1     
  Lines         234408   234429   +21     
  Branches       28232    28236    +4     
==========================================
+ Hits           96032    96060   +28     
+ Misses        138376   138369    -7     

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