Avif YUV decoder, drop dcv, high bit depth #1672

Job	Run time
Fuzz targets (afl)	2m 0s
build_benchmarks	46s
Fuzz targets (cargo-fuzz)	51s
cargo-deny	21s
cargo-semver-checks	27s
clippy	2m 4s
public_private_dependencies	23s
rustfmt	14s
test_avif_decoding	1m 27s
test_other_archs (powerpc-unknown-linux-gnu)	2m 27s
test_other_archs (i686-unknown-linux-gnu)	1m 27s
test_features	24s
test_toolchains (1.70.0)	32s
test_toolchains (nightly)	1m 5s
test_features (default)	1m 45s
test_features (rayon)	33s
test_toolchains (beta)	1m 25s
test_features (avif)	1m 3s
test_features (bmp)	26s
test_features (dds)	28s
test_features (exr)	43s
test_features (ff)	22s
test_features (gif)	24s
test_features (hdr)	29s
test_features (ico)	37s
test_features (jpeg)	31s
test_features (png)	34s
test_features (pnm)	24s
test_features (qoi)	24s
test_features (tga)	24s
test_features (tiff)	37s
test_features (webp)	28s
	26m 5s

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