perf(simd): vectorize I8x16::saturating_abs (VPABSB) + binding W1a tests #513

Job	Run time
format/stable	21s
clippy/1.95.0	39s
tier4-avx512-check	27s
Pass MSRV values to other jobs	3s
hpc-stream-parallel/rayon	1m 26s
nostd/thumbv6m-none-eabi/stable	27s
native-backend/stable	7m 41s
cargo-careful	0s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	0s
nightly-simd-polyfill	0s
miri	0s
docs/nightly	0s
blas-msrv	45s
tests/1.95.0	11m 8s
tests/beta	10m 52s
tests/stable	9m 25s
conclusion	0s
	43m 14s

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