enhance: Add metrics for l0 segment rowNum and memSize

[weiliu1031]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.97%. Comparing base (837ac29) to head (3b83656).
Report is 2 commits behind head on master.

❌ Your project status has failed because the head coverage (69.97%) is below the target coverage (77.00%). You can increase the head coverage or adjust the target coverage.

❗ There is a different number of reports uploaded between BASE (837ac29) and HEAD (3b83656). Click for more details.

HEAD has 2 uploads less than BASE

Flag	BASE (837ac29)	HEAD (3b83656)
	3	1

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #40299       +/-   ##
===========================================
- Coverage   80.53%   69.97%   -10.57%     
===========================================
  Files        1470      309     -1161     
  Lines      206664    27718   -178946     
===========================================
- Hits       166442    19396   -147046     
+ Misses      34177     8322    -25855     
+ Partials     6045        0     -6045     

Components	Coverage Δ
Client	∅ <ø> (∅)
Core	69.97% <ø> (ø)
Go	∅ <ø> (∅)

see 1161 files with indirect coverage changes

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