perf: Emit smaller side in hash join

[colin-ho]

This brings down Q5 (SQL + join ordering) down from 150s -> 67s.

[codecov]

Codecov Report

Attention: Patch coverage is 96.29630% with 1 line in your changes missing coverage. Please review.

Project coverage is 78.53%. Comparing base (0f80380) to head (ded395b).

Files with missing lines	Patch %	Lines
src/daft-physical-plan/src/ops/hash_join.rs	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3964      +/-   ##
==========================================
+ Coverage   78.51%   78.53%   +0.01%     
==========================================
  Files         774      774              
  Lines       98542    98554      +12     
==========================================
+ Hits        77374    77395      +21     
+ Misses      21168    21159       -9     

Files with missing lines	Coverage Δ
daft/execution/physical_plan.py	94.53% <100.00%> (+<0.01%)	⬆️
daft/execution/rust_physical_plan_shim.py	95.60% <ø> (ø)
src/daft-scheduler/src/scheduler.rs	92.99% <100.00%> (+0.02%)	⬆️
src/daft-physical-plan/src/ops/hash_join.rs	39.68% <88.88%> (+8.20%)	⬆️

... and 2 files with indirect coverage changes

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