Remove ExprArray and ExprOptimizer

[gatesn]

In favor of using ScalarFnArray in the future

[codspeed-hq]

CodSpeed Performance Report

Merging #5585 will degrade performances by 12.44%

_{Comparing ngates/scalar-fn-impl (668fb43) with develop (ef33c36)}

Summary

❌ 2 regressions
✅ 1502 untouched
⏩ 271 skipped¹

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
❌	bench_many_nulls[0.5]	322.7 µs	359 µs	-10.13%
❌	bench_many_nulls[0.9]	461.5 µs	527.1 µs	-12.44%

Footnotes

1. 271 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 66.87307% with 107 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.91%. Comparing base (ef33c36) to head (668fb43).
⚠️ Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
vortex-array/src/expr/functions/vtable.rs	0.00%	38 Missing ⚠️
vortex-array/src/session/mod.rs	73.49%	22 Missing ⚠️
vortex-array/src/expr/functions/scalar.rs	0.00%	17 Missing ⚠️
vortex-array/src/optimizer/rules.rs	64.44%	16 Missing ⚠️
vortex-array/src/optimizer/mod.rs	89.47%	14 Missing ⚠️

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