fix: Fix slow dist handle and slow observe

[bigsheeper]

1. Provide partition&channel level indexing in the collection target.
2. Make SegmentAction not wait for distribution.
3. Remove scheduler and target manager mutex.
4. Optimize logging to reduce CPU overhead.

issue: #37630

[bigsheeper]

slow dist handling:

slow observation:

[codecov]

Codecov Report

Attention: Patch coverage is 90.75630% with 22 lines in your changes missing coverage. Please review.

Project coverage is 82.94%. Comparing base (d7623ab) to head (66e7e05).

Files with missing lines	Patch %	Lines
internal/querycoordv2/task/scheduler.go	87.21%	16 Missing and 1 partial ⚠️
...rnal/querycoordv2/observers/collection_observer.go	83.33%	4 Missing ⚠️
internal/querycoordv2/meta/target.go	98.24%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #38566       +/-   ##
===========================================
+ Coverage   69.54%   82.94%   +13.39%     
===========================================
  Files         296     1092      +796     
  Lines       26536   169780   +143244     
===========================================
+ Hits        18455   140819   +122364     
- Misses       8081    23374    +15293     
- Partials        0     5587     +5587     

Components	Coverage Δ
Client	79.12% <ø> (∅)
Core	∅ <ø> (∅)
Go	83.09% <90.75%> (∅)

Files with missing lines	Coverage Δ
internal/querycoordv2/dist/dist_handler.go	96.13% <100.00%> (ø)
internal/querycoordv2/meta/target_manager.go	88.19% <100.00%> (ø)
internal/querycoordv2/task/action.go	96.66% <100.00%> (ø)
internal/querycoordv2/utils/util.go	85.54% <100.00%> (ø)
internal/querynodev2/services.go	86.79% <100.00%> (ø)
pkg/metrics/querycoord_metrics.go	100.00% <ø> (ø)
internal/querycoordv2/meta/target.go	92.94% <98.24%> (ø)
...rnal/querycoordv2/observers/collection_observer.go	86.52% <83.33%> (ø)
internal/querycoordv2/task/scheduler.go	87.41% <87.21%> (ø)

... and 1379 files with indirect coverage changes

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