Use SIMD to speed up clamping #997

Job	Run time
build_benchmarks	1m 6s
Fuzz targets (afl)	2m 15s
cargo-deny	28s
Fuzz targets (cargo-fuzz)	6m 58s
clippy	3m 18s
public_private_dependencies	23s
rustfmt	16s
test_avif	1m 59s
test_avif_decoding	1m 53s
test_big_endian	1m 16s
test_big_endian (default)	2m 59s
test_features	49s
test_toolchains (1.61.0)	4m 57s
verify_msrv	4m 37s
test_features (default)	1m 59s
test_big_endian (webp)	1m 39s
test_toolchains (nightly)	2m 47s
test_features (gif)	49s
test_big_endian (webp-encoder)	2m 40s
test_toolchains (beta)	1m 56s
test_features (jpeg)	1m 10s
test_features (png)	56s
test_features (tiff)	51s
test_features (ico)	59s
test_features (pnm)	52s
test_features (tga)	41s
test_features (webp)	1m 5s
test_features (bmp)	47s
test_features (hdr)	43s
test_features (dxt)	38s
test_features (dds)	46s
test_features (farbfeld)	55s
test_features (openexr)	1m 6s
test_features (jpeg_rayon)	1m 3s
test_features (webp-encoder)	1m 22s
	58m 58s

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