Avif YUV decoder, drop dcv, high bit depth #1674

Job	Run time
Fuzz targets (cargo-fuzz)	51s
Fuzz targets (afl)	2m 8s
cargo-deny	21s
build_benchmarks	46s
cargo-semver-checks	28s
clippy	2m 7s
public_private_dependencies	23s
rustfmt	12s
test_avif_decoding	1m 24s
test_features	22s
test_other_archs (powerpc-unknown-linux-gnu)	2m 26s
test_features (default)	1m 51s
test_other_archs (i686-unknown-linux-gnu)	1m 22s
test_toolchains (1.70.0)	25s
test_features (rayon)	28s
test_toolchains (nightly)	1m 12s
test_features (avif)	1m 1s
test_toolchains (beta)	1m 23s
test_features (bmp)	24s
test_features (dds)	23s
test_features (exr)	39s
test_features (ff)	17s
test_features (gif)	25s
test_features (hdr)	22s
test_features (ico)	30s
test_features (jpeg)	24s
test_features (png)	26s
test_features (pnm)	30s
test_features (qoi)	23s
test_features (tga)	22s
test_features (tiff)	36s
test_features (webp)	31s
	25m 22s

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