[wip] PatchedArray wiring: Part 2

[a10y]

Summary

Part of #6535 epic and successor to #7002

This wires PatchedArray through to BitPackedArray, replacing the interior Patches entirely. This change is backward compatible.

API Changes

1. Updates VTable::build to return ArrayRef instead of V::Array. This allows us to lazily deserialize a previously written value as a new type in a backward-compatible way
2. Adds a new LazyPatchedArray which is just a dummy node that holds on to an array and some Patches, has no reductions and can just be executed into a transposed PatchedArray
3. Removes the patches child from BitPackedArray
4. Removes the BitPackedArray::encode() and a mess of other functions, instead moving everything into a new BitPackedEncoder fluent API

Testing

Reuses our existing and extensive test suite for BP

[codspeed-hq]

Merging this PR will degrade performance by 20.33%

❌ 4 regressed benchmarks
✅ 424 untouched benchmarks
⏩ 2200 skipped benchmarks¹

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

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Simulation	compress_rd[f32, 10000]	251.4 µs	310.7 µs	-19.08%
❌	Simulation	compress_rd[f32, 100000]	2.3 ms	2.9 ms	-20.33%
❌	Simulation	compress_rd[f64, 10000]	312.5 µs	377.2 µs	-17.16%
❌	Simulation	compress_rd[f64, 100000]	2.9 ms	3.5 ms	-17.08%

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_{Comparing aduffy/lazy-patches (595fd92) with develop (fcfd443)}

Footnotes

1. 2200 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. ↩

[a10y]

todo: add these back