Experiment: porting the improvements from rapidhash#32

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hoxxep:rapidhash

Commits on Aug 5, 2025

Experiments with Hash::write string hashing improvements from rapidhash
hoxxep
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Add rapidhash to the foldhash benchmarks to make sure I've not unfairly run the rapidhash benchmarks somehow
hoxxep
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Mark medium as inline(never) not cold, medium length performance improvement, englishword -5%, url -6%
hoxxep
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Store a reference to the seeds array in FoldHasher, struuid -24.5%, strdate -38%
hoxxep
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Add read_u64 and read_u32 helper methods to test bounds checks
hoxxep
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Set codegen-units=1 and incremental=false for consistent benchmarking
hoxxep
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Re-implement read_u64 and read_u32 in a safe manner that the compiler can omit the bounds checks for
hoxxep
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Replace seed wrapping_add back to rotate_right, confirmed no performance penalty
hoxxep
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