Chore: Refactor FilterArray code

[connortsui20]

This is a mostly cosmetic change to remove the old filter compute kernels from the FilterArray implementation, placing the code in vortex-array/src/arrays/filter/execute instead of dispersed everywhere. The non-cosmetic changes are trivial, just making some things cleaner to understand.

This is based on top of #6147, which is also based on top of #6146

[codspeed-hq]

CodSpeed Performance Report

Merging this PR will degrade performance by 20.02%

_{Comparing ct/refactor-filter-array (8abe15d) with ct/remove-old-filter-compute (52e8194)}

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

Summary

⚡ 11 improved benchmarks
❌ 7 regressed benchmarks
✅ 1143 untouched benchmarks
⏩ 1398 skipped benchmarks¹

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

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	WallTime	u8_FoR[10M]	38.7 µs	9.2 µs	×4.2
⚡	Simulation	canonical_into_non_nullable[(10000, 1, 0.1)]	58 µs	47.1 µs	+23.18%
⚡	Simulation	canonical_into_non_nullable[(10000, 10, 0.0)]	280.2 µs	194.2 µs	+44.29%
⚡	Simulation	canonical_into_non_nullable[(10000, 1, 0.01)]	42.1 µs	31.3 µs	+34.41%
⚡	Simulation	canonical_into_non_nullable[(10000, 10, 0.01)]	307.5 µs	221.2 µs	+38.99%
⚡	Simulation	canonical_into_non_nullable[(10000, 10, 0.1)]	473.1 µs	380.7 µs	+24.27%
⚡	Simulation	canonical_into_non_nullable[(10000, 1, 0.0)]	37.1 µs	24.8 µs	+49.51%
❌	Simulation	canonical_into_nullable[(10000, 100, 0.0)]	4.3 ms	4.9 ms	-12.33%
❌	Simulation	into_canonical_non_nullable[(10000, 1, 0.01)]	39.1 µs	47 µs	-16.88%
❌	Simulation	into_canonical_non_nullable[(10000, 1, 0.0)]	32.9 µs	41.1 µs	-20.02%
❌	Simulation	into_canonical_non_nullable[(10000, 1, 0.1)]	55.2 µs	63.6 µs	-13.14%
⚡	Simulation	into_canonical_non_nullable[(10000, 10, 0.0)]	282.3 µs	188.8 µs	+49.5%
⚡	Simulation	into_canonical_non_nullable[(10000, 10, 0.01)]	309.2 µs	216.4 µs	+42.85%
⚡	Simulation	into_canonical_non_nullable[(10000, 10, 0.1)]	471.6 µs	375.5 µs	+25.6%
❌	Simulation	into_canonical_nullable[(10000, 10, 0.0)]	454.9 µs	538.5 µs	-15.52%
❌	Simulation	into_canonical_nullable[(10000, 100, 0.0)]	4.3 ms	5.1 ms	-14.61%
❌	Simulation	into_canonical_nullable[(10000, 100, 0.1)]	6.1 ms	6.9 ms	-12.08%
⚡	Simulation	into_canonical_nullable[(10000, 10, 0.1)]	716 µs	628.9 µs	+13.85%

Footnotes

1. 1398 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. ↩