enhance: Enable score based balance channel policy

[weiliu1031]

issue: #38142
current balance channel policy only consider current collection's distribution, so if all collections has 1 channel, and all channels has been loaded on same querynode, after querynode num increase, balance channel won't be triggered.

This PR enable score based balance channel policy, to achieve:

1. distribute all channels evenly across multiple querynodes
2. distribute each collection's channel evenly across multiple querynodes.

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[codecov]

Codecov Report

Attention: Patch coverage is 97.07317% with 6 lines in your changes missing coverage. Please review.

Project coverage is 81.11%. Comparing base (4c623ce) to head (e175a84).
Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
...ernal/querycoordv2/balance/score_based_balancer.go	97.28%	3 Missing and 2 partials ⚠️
internal/querycoordv2/utils/meta.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #38143       +/-   ##
===========================================
+ Coverage   68.87%   81.11%   +12.24%     
===========================================
  Files         289     1370     +1081     
  Lines       25484   191284   +165800     
===========================================
+ Hits        17551   155163   +137612     
- Misses       7933    30641    +22708     
- Partials        0     5480     +5480     

Components	Coverage Δ
Client	73.67% <ø> (∅)
Core	68.87% <ø> (ø)
Go	83.25% <97.07%> (∅)

Files with missing lines	Coverage Δ
internal/querycoordv2/balance/balance.go	94.11% <100.00%> (ø)
...erycoordv2/balance/channel_level_score_balancer.go	93.78% <100.00%> (ø)
...al/querycoordv2/balance/rowcount_based_balancer.go	94.73% <100.00%> (ø)
internal/querycoordv2/checkers/channel_checker.go	87.13% <100.00%> (ø)
internal/querycoordv2/handlers.go	74.25% <100.00%> (ø)
pkg/util/paramtable/component_param.go	98.37% <100.00%> (ø)
internal/querycoordv2/utils/meta.go	71.52% <0.00%> (ø)
...ernal/querycoordv2/balance/score_based_balancer.go	97.24% <97.28%> (ø)

... and 1073 files with indirect coverage changes

[weiliu1031]

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