Add decoding hooks #1667

Job	Run time
test_avif_decoding	2m 0s
Fuzz targets (cargo-fuzz)	49s
Fuzz targets (afl)	2m 2s
clippy	2m 18s
cargo-deny	19s
public_private_dependencies	24s
rustfmt	15s
test_features	30s
test_features (default)	1m 50s
test_other_archs (powerpc-unknown-linux-gnu)	2m 55s
test_toolchains (1.70.0)	28s
test_features (rayon)	41s
test_other_archs (i686-unknown-linux-gnu)	2m 17s
test_toolchains (nightly)	1m 31s
test_features (avif)	59s
test_features (bmp)	37s
test_toolchains (beta)	1m 37s
test_features (dds)	38s
build_benchmarks	45s
test_features (exr)	54s
test_features (ff)	32s
cargo-semver-checks	35s
test_features (gif)	39s
test_features (hdr)	34s
test_features (ico)	47s
test_features (jpeg)	34s
test_features (png)	42s
test_features (pnm)	34s
test_features (qoi)	32s
test_features (tga)	38s
test_features (tiff)	38s
test_features (webp)	35s
	31m 9s

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