Push runend lists into listview slots

[danking]

Summary

• rewrite RunEnd canonicalization as a ListView with RunEnd offsets and sizes slots
• preserve the elements child without eager list metadata expansion
• add a regression test that offsets and sizes stay RunEnd after canonicalizing to ListView

Stack

• Stacked on Support runend canonicalization for lists #9708 / dk/runend-list-canonicalize

Tests

• cargo test -p vortex-runend test_runend_list -- --nocapture
• cargo test -p vortex-runend
• cargo clippy -p vortex-runend --all-targets --all-features
• cargo +nightly fmt --all

[codspeed-hq]

Merging this PR will regress 4 benchmarks

⚠️ 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.

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 4 improved benchmarks
❌ 4 regressed benchmarks
✅ 2082 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
❌	Simulation	cached_indices_i32[0.01]	37.5 µs	51.6 µs	-27.2%
❌	WallTime	arrow_checked_add_u32_avx512[16384]	17.7 µs	21.4 µs	-17.47%
❌	WallTime	arrow_checked_add_u32_avx2[16384]	17.7 µs	21.3 µs	-16.74%
❌	Simulation	cold_misaligned[(16, 64)]	345.2 µs	389.9 µs	-11.48%
⚡	WallTime	arrow_checked_add_u32_neon[16384]	20.3 µs	12.2 µs	+66.1%
⚡	Simulation	cached_indices_i128[0.01]	61.6 µs	47.9 µs	+28.79%
⚡	WallTime	words_gather_scalar_avx2[65536]	9.4 µs	8.2 µs	+13.7%
⚡	Simulation	compress_fsst[(500, 64, 8)]	536.2 µs	481.5 µs	+11.36%

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/runend-listview-pushdown (4945d6a) with dk/runend-list-canonicalize (cec8d20)³}

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. ↩

3. No successful run was found on dk/runend-list-canonicalize (97953be) during the generation of this report, so 74ec490 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

[robert3005]

I think this is probably what you want here