Layout Reader V2

[gatesn]

Draft PR demonstrating the V2 Reader API.

This API simplifies expression push-down and pruning (using similar reduce/reduce_parent workflow as the operators change), improves performance with coarser partitions rather than individual splits, and integrates more cleanly with the DataSource API proposal in #5949

[cloudflare-workers-and-pages]

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[codspeed-hq]

Merging this PR will improve performance by 34.98%

⚡ 1 improved benchmark
✅ 1137 untouched benchmarks
⏩ 1265 skipped benchmarks¹

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Simulation	chunked_bool_into_canonical[(1000, 10)]	88.6 µs	65.6 µs	+34.98%

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_{Comparing ngates/layout2 (b690791) with develop (12ae21e)}

Footnotes

1. 1265 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. ↩