Add decoding hooks #1666

Job	Run time
cargo-deny	21s
Fuzz targets (cargo-fuzz)	48s
Fuzz targets (afl)	2m 1s
build_benchmarks	49s
cargo-semver-checks	33s
clippy	2m 1s
public_private_dependencies	26s
rustfmt	15s
test_avif_decoding	1m 42s
test_features	40s
test_other_archs (powerpc-unknown-linux-gnu)	2m 43s
test_toolchains (1.70.0)	26s
test_features (default)	5m 53s
test_other_archs (i686-unknown-linux-gnu)	1m 43s
test_features (rayon)	36s
test_toolchains (nightly)	1m 32s
test_features (avif)	55s
test_toolchains (beta)	1m 36s
test_features (bmp)	28s
test_features (dds)	38s
test_features (exr)	51s
test_features (ff)	37s
test_features (gif)	36s
test_features (hdr)	37s
test_features (ico)	54s
test_features (jpeg)	29s
test_features (png)	38s
test_features (pnm)	40s
test_features (qoi)	34s
test_features (tga)	37s
test_features (tiff)	39s
test_features (webp)	44s
	34m 2s

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