Avif YUV decoder, drop dcv, high bit depth #1673

Job	Run time
test_avif_decoding	1m 27s
test_other_archs (powerpc-unknown-linux-gnu)	2m 30s
test_other_archs (i686-unknown-linux-gnu)	1m 27s
Fuzz targets (afl)	2m 3s
build_benchmarks	46s
Fuzz targets (cargo-fuzz)	51s
clippy	2m 3s
public_private_dependencies	26s
rustfmt	14s
test_features	22s
test_toolchains (1.70.0)	28s
test_features (default)	1m 49s
test_toolchains (nightly)	1m 5s
cargo-deny	19s
test_features (rayon)	31s
test_toolchains (beta)	1m 18s
test_features (avif)	58s
test_features (bmp)	27s
cargo-semver-checks	31s
test_features (dds)	29s
test_features (exr)	46s
test_features (ff)	22s
test_features (gif)	26s
test_features (hdr)	23s
test_features (ico)	33s
test_features (jpeg)	26s
test_features (png)	35s
test_features (pnm)	29s
test_features (qoi)	23s
test_features (tga)	24s
test_features (tiff)	32s
test_features (webp)	26s
	25m 49s

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