Add MaskFn

[gatesn]

No description provided.

[codspeed-hq]

CodSpeed Performance Report

Merging #5606 will not alter performance

_{Comparing ngates/mask-fn (a028d26) with develop (80e01eb)}

Summary

✅ 1158 untouched
⏩ 617 skipped¹

Footnotes

1. 617 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[codecov]

Codecov Report

❌ Patch coverage is 1.16279% with 170 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.42%. Comparing base (80e01eb) to head (a028d26).
⚠️ Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
vortex-array/src/scalar_fns/mask/mod.rs	0.00%	43 Missing ⚠️
vortex-vector/src/primitive/scalar.rs	0.00%	19 Missing ⚠️
vortex-array/src/scalar_fns/mod.rs	5.26%	18 Missing ⚠️
vortex-vector/src/decimal/scalar.rs	0.00%	14 Missing ⚠️
vortex-mask/src/lib.rs	0.00%	5 Missing ⚠️
vortex-vector/src/binaryview/scalar.rs	0.00%	5 Missing ⚠️
vortex-vector/src/bool/scalar.rs	0.00%	5 Missing ⚠️
vortex-vector/src/fixed_size_list/scalar.rs	0.00%	5 Missing ⚠️
vortex-vector/src/listview/scalar.rs	0.00%	5 Missing ⚠️
vortex-vector/src/struct_/scalar.rs	0.00%	5 Missing ⚠️
... and 19 more

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[joseph-isaacs]

match each scalar?