Avif YUV decoder, drop dcv, high bit depth #1696

Job	Run time
cargo-deny	20s
build_benchmarks	45s
Fuzz targets (afl)	2m 6s
Fuzz targets (cargo-fuzz)	50s
cargo-semver-checks	30s
clippy	2m 2s
public_private_dependencies	23s
rustfmt	12s
test_avif_decoding	1m 25s
test_features	34s
test_other_archs (powerpc-unknown-linux-gnu)	3m 2s
test_features (default)	1m 50s
test_toolchains (1.70.0)	30s
test_other_archs (i686-unknown-linux-gnu)	5m 2s
test_features (rayon)	35s
test_toolchains (nightly)	1m 21s
test_features (avif)	1m 0s
test_toolchains (beta)	1m 41s
test_features (bmp)	32s
test_features (dds)	36s
test_features (exr)	48s
test_features (ff)	30s
test_features (gif)	37s
test_features (hdr)	36s
test_features (ico)	45s
test_features (jpeg)	31s
test_features (pcx)	34s
test_features (png)	36s
test_features (pnm)	34s
test_features (qoi)	29s
test_features (tga)	31s
test_features (tiff)	1m 9s
test_features (webp)	33s
	33m 29s

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