Avif YUV decoder, drop dcv, high bit depth #1697

Job	Run time
cargo-deny	19s
Fuzz targets (afl)	2m 46s
Fuzz targets (cargo-fuzz)	52s
build_benchmarks	44s
cargo-semver-checks	32s
clippy	2m 5s
public_private_dependencies	23s
rustfmt	12s
test_avif_decoding	2m 9s
test_other_archs (powerpc-unknown-linux-gnu)	2m 36s
test_features	36s
test_other_archs (i686-unknown-linux-gnu)	1m 30s
test_toolchains (1.70.0)	33s
test_features (default)	1m 46s
test_toolchains (nightly)	1m 20s
test_features (rayon)	32s
test_toolchains (beta)	1m 30s
test_features (avif)	1m 8s
test_features (bmp)	32s
test_features (dds)	37s
test_features (exr)	47s
test_features (ff)	32s
test_features (gif)	32s
test_features (hdr)	38s
test_features (ico)	39s
test_features (jpeg)	52s
test_features (pcx)	35s
test_features (png)	43s
test_features (pnm)	42s
test_features (qoi)	30s
test_features (tga)	25s
test_features (tiff)	30s
test_features (webp)	47s
	30m 54s

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