Avif YUV decoder, drop dcv, high bit depth #1669

Job	Run time
Fuzz targets (cargo-fuzz)	1m 0s
build_benchmarks	52s
Fuzz targets (afl)	2m 8s
cargo-deny	18s
cargo-semver-checks	36s
clippy	2m 6s
public_private_dependencies	24s
rustfmt	13s
test_avif_decoding	1m 26s
test_features	40s
test_other_archs (powerpc-unknown-linux-gnu)	3m 12s
test_features (default)	2m 0s
test_toolchains (1.70.0)	40s
test_other_archs (i686-unknown-linux-gnu)	1m 56s
test_features (rayon)	33s
test_toolchains (nightly)	1m 49s
test_features (avif)	1m 7s
test_toolchains (beta)	1m 53s
test_features (bmp)	43s
test_features (dds)	43s
test_features (exr)	53s
test_features (ff)	48s
test_features (gif)	37s
test_features (hdr)	37s
test_features (ico)	38s
test_features (jpeg)	43s
test_features (png)	46s
test_features (pnm)	23s
test_features (qoi)	31s
test_features (tga)	32s
test_features (tiff)	30s
test_features (webp)	28s
	31m 45s

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