Avif YUV decoder, drop dcv, high bit depth #1688

Job	Run time
test_avif_decoding	1m 26s
test_features	28s
test_features (default)	1m 47s
Fuzz targets (afl)	2m 6s
build_benchmarks	45s
test_features (rayon)	32s
Fuzz targets (cargo-fuzz)	54s
test_features (avif)	1m 3s
cargo-deny	21s
test_features (bmp)	30s
cargo-semver-checks	23s
clippy	2m 0s
test_features (dds)	23s
test_features (exr)	43s
public_private_dependencies	26s
rustfmt	15s
test_features (ff)	28s
test_other_archs (powerpc-unknown-linux-gnu)	2m 54s
test_features (gif)	30s
test_other_archs (i686-unknown-linux-gnu)	1m 35s
test_features (hdr)	28s
test_toolchains (1.70.0)	32s
test_features (ico)	33s
test_toolchains (nightly)	1m 8s
test_features (jpeg)	25s
test_toolchains (beta)	1m 25s
test_features (pcx)	28s
test_features (png)	28s
test_features (pnm)	26s
test_features (qoi)	21s
test_features (tga)	25s
test_features (tiff)	30s
test_features (webp)	28s
	27m 6s

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