feat: support delete(aggregator)

[dl239]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

• What is the current behavior? (You can also link to an open issue here)

• What is the new behavior (if this is a feature change)?

[codecov]

Codecov Report

Attention: 64 lines in your changes are missing coverage. Please review.

Comparison is base (190992d) 75.33% compared to head (823a2b1) 75.33%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##               main    #3327    +/-   ##
==========================================
  Coverage     75.33%   75.33%            
  Complexity      587      587            
==========================================
  Files           718      718            
  Lines        129780   130018   +238     
  Branches       1280     1280            
==========================================
+ Hits          97765    97951   +186     
- Misses        31729    31781    +52     
  Partials        286      286            

Files	Coverage Δ
src/storage/aggregator.h	100.00% <ø> (ø)
src/storage/aggregator_test.cc	98.34% <100.00%> (+<0.01%)	⬆️
src/storage/disk_table.h	83.78% <ø> (ø)
src/storage/mem_table.h	100.00% <ø> (ø)
src/storage/table.h	92.85% <ø> (ø)
src/tablet/combine_iterator.h	65.57% <100.00%> (ø)
src/storage/mem_table.cc	89.11% <95.23%> (+0.87%)	⬆️
src/tablet/tablet_impl_test.cc	99.53% <99.50%> (-0.02%)	⬇️
src/storage/disk_table.cc	86.12% <58.33%> (ø)
src/storage/aggregator.cc	78.32% <84.90%> (+1.40%)	⬆️
... and 1 more

... and 27 files with indirect coverage changes

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