Avif YUV decoder, drop dcv, high bit depth #1689

Job	Run time
test_avif_decoding	1m 26s
test_features	28s
Fuzz targets (cargo-fuzz)	53s
test_features (default)	1m 44s
Fuzz targets (afl)	2m 1s
clippy	2m 11s
test_features (rayon)	33s
test_features (avif)	56s
public_private_dependencies	26s
test_features (bmp)	26s
test_other_archs (powerpc-unknown-linux-gnu)	2m 22s
test_toolchains (1.70.0)	27s
test_features (dds)	24s
test_other_archs (i686-unknown-linux-gnu)	2m 45s
test_toolchains (nightly)	1m 6s
test_features (exr)	39s
test_toolchains (beta)	1m 25s
test_features (ff)	21s
build_benchmarks	48s
test_features (gif)	20s
cargo-deny	18s
cargo-semver-checks	26s
test_features (hdr)	24s
test_features (ico)	37s
rustfmt	12s
test_features (jpeg)	25s
test_features (pcx)	29s
test_features (png)	29s
test_features (pnm)	30s
test_features (qoi)	28s
test_features (tga)	25s
test_features (tiff)	38s
test_features (webp)	26s
	27m 28s

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