Avif YUV decoder, drop dcv, high bit depth #1676

Job	Run time
test_other_archs (powerpc-unknown-linux-gnu)	2m 25s
test_features	28s
test_other_archs (i686-unknown-linux-gnu)	1m 39s
test_features (default)	1m 59s
Fuzz targets (afl)	2m 9s
test_features (rayon)	33s
build_benchmarks	47s
test_features (avif)	1m 5s
Fuzz targets (cargo-fuzz)	48s
test_features (bmp)	30s
cargo-deny	21s
clippy	2m 3s
test_features (dds)	23s
public_private_dependencies	24s
test_features (exr)	43s
test_features (ff)	21s
rustfmt	14s
test_avif_decoding	1m 29s
test_features (gif)	18s
test_toolchains (1.70.0)	27s
test_features (hdr)	30s
test_toolchains (nightly)	1m 3s
test_features (ico)	38s
cargo-semver-checks	27s
test_toolchains (beta)	1m 19s
test_features (jpeg)	26s
test_features (png)	38s
test_features (pnm)	23s
test_features (qoi)	28s
test_features (tga)	22s
test_features (tiff)	36s
test_features (webp)	30s
	26m 26s

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