[CHORE]: prepare for nulls first/last kernels

[universalmind303]

This pr adds nulls_first to all sort functions in preparation for implementing the nulls first/last kernels. This will be followed up by adding the actual nulls first/last implementations.

[codspeed-hq]

CodSpeed Performance Report

Merging #3301 will improve performances by 67.12%

_{Comparing universalmind303:nulls-first (017c480) with main (1b84250)}

Summary

⚡ 1 improvements
✅ 16 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	universalmind303:nulls-first	Change
⚡	test_iter_rows_first_row[100 Small Files]	312.1 ms	186.8 ms	+67.12%

[codecov]

Codecov Report

Attention: Patch coverage is 73.01980% with 109 lines in your changes missing coverage. Please review.

Project coverage is 77.31%. Comparing base (0709691) to head (017c480).
Report is 18 commits behind head on main.

Files with missing lines	Patch %	Lines
src/daft-core/src/array/ops/sort.rs	59.42%	28 Missing ⚠️
daft/table/table.py	9.52%	19 Missing ⚠️
src/daft-table/src/python.rs	0.00%	12 Missing ⚠️
daft/table/micropartition.py	54.54%	10 Missing ⚠️
src/daft-sql/src/planner.rs	77.27%	10 Missing ⚠️
src/daft-physical-plan/src/ops/sort.rs	20.00%	8 Missing ⚠️
src/daft-core/src/utils/mod.rs	64.70%	6 Missing ⚠️
src/daft-table/src/ops/groups.rs	0.00%	5 Missing ⚠️
daft/expressions/expressions.py	66.66%	2 Missing ⚠️
daft/series.py	85.71%	2 Missing ⚠️
... and 6 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3301      +/-   ##
==========================================
- Coverage   77.59%   77.31%   -0.29%     
==========================================
  Files         668      678      +10     
  Lines       82211    83063     +852     
==========================================
+ Hits        63793    64218     +425     
- Misses      18418    18845     +427     

Files with missing lines	Coverage Δ
daft/dataframe/dataframe.py	86.65% <100.00%> (ø)
daft/execution/execution_step.py	89.47% <100.00%> (+0.03%)	⬆️
daft/execution/physical_plan.py	94.01% <ø> (ø)
daft/execution/rust_physical_plan_shim.py	95.60% <ø> (ø)
src/daft-core/src/python/series.rs	94.70% <100.00%> (+0.02%)	⬆️
src/daft-core/src/series/array_impl/data_array.rs	95.95% <100.00%> (ø)
...c/daft-core/src/series/array_impl/logical_array.rs	94.44% <100.00%> (ø)
src/daft-core/src/series/ops/list.rs	64.49% <100.00%> (+1.05%)	⬆️
src/daft-local-execution/src/pipeline.rs	95.43% <100.00%> (+0.01%)	⬆️
src/daft-local-execution/src/sinks/sort.rs	96.15% <100.00%> (+0.40%)	⬆️
... and 31 more

... and 28 files with indirect coverage changes

---- 🚨 Try these New Features:

• Flaky Tests Detection - Detect and resolve failed and flaky tests

[samster25]

Amazing!