[FEAT] Enable unpivot for swordfish

[colin-ho]

Adds unpivot as an intermediate operator. Unskips all the unpivot tests

[codspeed-hq]

CodSpeed Performance Report

Merging #3078 will not alter performance

_{Comparing colin/unpivot (dddc568) with main (4a8244b)}

Summary

✅ 17 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.51%. Comparing base (4a8244b) to head (dddc568).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3078      +/-   ##
==========================================
+ Coverage   78.49%   78.51%   +0.01%     
==========================================
  Files         613      614       +1     
  Lines       72761    72821      +60     
==========================================
+ Hits        57111    57172      +61     
+ Misses      15650    15649       -1     

Files with missing lines	Coverage Δ
...ft-local-execution/src/intermediate_ops/unpivot.rs	100.00% <100.00%> (ø)
src/daft-local-execution/src/pipeline.rs	92.72% <100.00%> (+0.38%)	⬆️
src/daft-physical-plan/src/local_plan.rs	89.20% <100.00%> (+1.11%)	⬆️
src/daft-physical-plan/src/translate.rs	94.73% <100.00%> (+0.42%)	⬆️

... and 1 file with indirect coverage changes

[kevinzwang]

LGTM 🔥