Avif YUV decoder, drop dcv, high bit depth #1687

Job	Run time
build_benchmarks	48s
cargo-deny	20s
Fuzz targets (cargo-fuzz)	47s
Fuzz targets (afl)	2m 12s
cargo-semver-checks	31s
clippy	2m 3s
public_private_dependencies	23s
rustfmt	11s
test_avif_decoding	1m 24s
test_features	35s
test_other_archs (powerpc-unknown-linux-gnu)	2m 54s
test_other_archs (i686-unknown-linux-gnu)	1m 56s
test_features (default)	1m 56s
test_toolchains (1.70.0)	45s
test_features (rayon)	37s
test_toolchains (nightly)	1m 26s
test_features (avif)	1m 6s
test_toolchains (beta)	1m 45s
test_features (bmp)	38s
test_features (dds)	33s
test_features (exr)	52s
test_features (ff)	37s
test_features (gif)	41s
test_features (hdr)	35s
test_features (ico)	42s
test_features (jpeg)	35s
test_features (pcx)	24s
test_features (png)	28s
test_features (pnm)	30s
test_features (qoi)	23s
test_features (tga)	28s
test_features (tiff)	30s
test_features (webp)	33s
	30m 8s

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