Avif YUV decoder, drop dcv, high bit depth #1670

Job	Run time
Fuzz targets (cargo-fuzz)	1m 1s
build_benchmarks	48s
Fuzz targets (afl)	2m 4s
cargo-deny	20s
cargo-semver-checks	26s
clippy	2m 21s
rustfmt	14s
public_private_dependencies	23s
test_avif_decoding	1m 23s
test_other_archs (powerpc-unknown-linux-gnu)	2m 30s
test_features	23s
test_other_archs (i686-unknown-linux-gnu)	1m 54s
test_toolchains (1.70.0)	32s
test_features (default)	1m 47s
test_toolchains (nightly)	1m 8s
test_features (rayon)	30s
test_toolchains (beta)	1m 18s
test_features (avif)	59s
test_features (bmp)	29s
test_features (dds)	34s
test_features (exr)	38s
test_features (ff)	29s
test_features (gif)	37s
test_features (hdr)	23s
test_features (ico)	31s
test_features (jpeg)	31s
test_features (png)	32s
test_features (pnm)	28s
test_features (qoi)	25s
test_features (tga)	24s
test_features (tiff)	30s
test_features (webp)	26s
	26m 58s

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