feat: nulls first kernels

[universalmind303]

No description provided.

[codspeed-hq]

CodSpeed Performance Report

Merging #3789 will improve performances by 12.19%

_{Comparing universalmind303:nulls-first-kernels (a7dcbad) with main (e5ff39f)}

Summary

⚡ 1 improvements
✅ 26 untouched benchmarks

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	test_count[1 Small File]	3.8 ms	3.4 ms	+12.19%

[codecov]

Codecov Report

Attention: Patch coverage is 93.93939% with 4 lines in your changes missing coverage. Please review.

Project coverage is 76.90%. Comparing base (2063d21) to head (a7dcbad).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/daft-core/src/array/ops/sort.rs	83.33%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3789      +/-   ##
==========================================
- Coverage   77.88%   76.90%   -0.99%     
==========================================
  Files         741      744       +3     
  Lines       93878    96922    +3044     
==========================================
+ Hits        73116    74534    +1418     
- Misses      20762    22388    +1626     

Files with missing lines	Coverage Δ
daft/dataframe/dataframe.py	85.25% <100.00%> (-0.27%)	⬇️
daft/execution/execution_step.py	89.65% <100.00%> (+0.01%)	⬆️
daft/execution/physical_plan.py	94.35% <ø> (ø)
...core/src/array/ops/arrow2/sort/primitive/common.rs	100.00% <100.00%> (ø)
...ore/src/array/ops/arrow2/sort/primitive/indices.rs	100.00% <100.00%> (ø)
src/daft-core/src/series/ops/sort.rs	62.06% <ø> (-2.45%)	⬇️
src/daft-core/src/array/ops/sort.rs	76.96% <83.33%> (+0.17%)	⬆️

... and 44 files with indirect coverage changes