Push get_item through wrapper arrays

[danking]

Summary

• push GetItem through Filter wrappers as Filter(GetItem(child), mask)
• push GetItem through Slice wrappers as Slice(GetItem(child), range)
• push GetItem through Masked wrappers as Mask(GetItem(child), masked_validity)
• add regression tests for all three wrapper cases

Tests

• cargo +nightly fmt --all
• cargo test -p vortex-array scalar_fn::fns::get_item::tests

[codspeed-hq]

Merging this PR will degrade performance by 10.57%

⚠️ 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.

⚡ 1 improved benchmark
❌ 1 regressed benchmark
✅ 2088 untouched benchmarks
⏩ 206 skipped benchmarks¹
🗄️ 4 archived benchmarks run²

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	WallTime	arrow_checked_add_u32_neon[16384]	13.5 µs	20.3 µs	-33.68%
⚡	WallTime	arrow_checked_add_u32_avx512[16384]	21.3 µs	17.6 µs	+20.59%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing dk/get-item-wrapper-pushdown (ee73b42) with develop (41da992)}

Footnotes

1. 206 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. ↩

2. 4 benchmarks were run, but are now archived. If they were deleted in another branch, consider rebasing to remove them from the report. Instead if they were added back, click here to restore them. ↩