Avif YUV decoder, drop dcv, high bit depth #1691

Job	Run time
test_avif_decoding	1m 14s
test_features	28s
test_features (default)	1m 46s
test_features (rayon)	31s
build_benchmarks	44s
test_features (avif)	1m 3s
Fuzz targets (afl)	2m 5s
Fuzz targets (cargo-fuzz)	50s
test_features (bmp)	24s
clippy	2m 6s
test_features (dds)	29s
public_private_dependencies	23s
rustfmt	14s
test_features (exr)	45s
test_features (ff)	17s
test_other_archs (powerpc-unknown-linux-gnu)	2m 32s
test_features (gif)	29s
test_toolchains (1.70.0)	36s
test_other_archs (i686-unknown-linux-gnu)	1m 18s
test_toolchains (nightly)	1m 4s
test_features (hdr)	25s
test_features (ico)	32s
test_toolchains (beta)	1m 23s
test_features (jpeg)	25s
cargo-deny	17s
cargo-semver-checks	23s
test_features (pcx)	22s
test_features (png)	29s
test_features (pnm)	30s
test_features (qoi)	22s
test_features (tga)	21s
test_features (tiff)	36s
test_features (webp)	27s
	25m 50s

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