enhance: Add L0 segment size protection

[XuanYang-cn]

See also: #37993

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enhance: improve search performance significantly 

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[codecov]

Codecov Report

Attention: Patch coverage is 70.76923% with 19 lines in your changes missing coverage. Please review.

Project coverage is 80.64%. Comparing base (6088a1f) to head (7b94cc7).
Report is 124 commits behind head on 2.4.

Files with missing lines	Patch %	Lines
internal/rootcoord/quota_center.go	36.00%	16 Missing ⚠️
pkg/metrics/datacoord_metrics.go	25.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              2.4   #38043      +/-   ##
==========================================
+ Coverage   80.63%   80.64%   +0.01%     
==========================================
  Files        1070     1070              
  Lines      167426   167489      +63     
==========================================
+ Hits       135000   135076      +76     
+ Misses      28005    27999       -6     
+ Partials     4421     4414       -7     

Files with missing lines	Coverage Δ
internal/datacoord/meta.go	89.50% <100.00%> (+0.06%)	⬆️
pkg/util/paramtable/quota_param.go	77.98% <100.00%> (+0.38%)	⬆️
pkg/metrics/datacoord_metrics.go	50.00% <25.00%> (-1.93%)	⬇️
internal/rootcoord/quota_center.go	82.01% <36.00%> (-1.70%)	⬇️

... and 34 files with indirect coverage changes

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