enhance: Enable channel exclusive balance policy

[weiliu1031]

issue: #32910

• split replica's node list to channels when create replicas
• balance nodes among channels when node change happens
• implement channel level balance, let balance happens in channel level

[mergify]

@weiliu1031

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[codecov]

Codecov Report

Attention: Patch coverage is 89.01099% with 30 lines in your changes are missing coverage. Please review.

Project coverage is 81.84%. Comparing base (efa58ae) to head (0846829).
Report is 13 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #32911      +/-   ##
==========================================
+ Coverage   81.82%   81.84%   +0.02%     
==========================================
  Files        1006     1007       +1     
  Lines      126831   127071     +240     
==========================================
+ Hits       103778   104001     +223     
- Misses      19126    19127       +1     
- Partials     3927     3943      +16     

Files	Coverage Δ
internal/querycoordv2/balance/balance.go	96.96% <ø> (ø)
internal/querycoordv2/checkers/channel_checker.go	85.21% <100.00%> (+0.65%)	⬆️
internal/querycoordv2/job/job_load.go	90.90% <100.00%> (+0.23%)	⬆️
internal/querycoordv2/meta/replica.go	100.00% <100.00%> (ø)
internal/querycoordv2/meta/replica_manager.go	82.01% <100.00%> (+0.56%)	⬆️
internal/querycoordv2/utils/meta.go	55.95% <100.00%> (-1.20%)	⬇️
pkg/util/paramtable/component_param.go	98.46% <100.00%> (+<0.01%)	⬆️
internal/querycoordv2/checkers/segment_checker.go	87.30% <60.00%> (-2.19%)	⬇️
internal/querycoordv2/server.go	82.35% <40.00%> (-1.19%)	⬇️
...erycoordv2/balance/channel_level_score_balancer.go	88.81% <88.81%> (ø)

... and 31 files with indirect coverage changes

[xiaofan-luan]

/lgtm
/approve

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: weiliu1031, xiaofan-luan

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• internal/proto/OWNERS [xiaofan-luan]
• internal/querycoordv2/OWNERS [xiaofan-luan]
• pkg/util/OWNERS [xiaofan-luan]
• tests/integration/OWNERS [xiaofan-luan]

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