Add decoding hooks #1661

Job	Run time
Fuzz targets (afl)	2m 29s
Fuzz targets (cargo-fuzz)	54s
cargo-deny	23s
build_benchmarks	47s
cargo-semver-checks	33s
clippy	2m 4s
public_private_dependencies	31s
rustfmt	14s
test_avif_decoding	1m 43s
test_other_archs (powerpc-unknown-linux-gnu)	2m 41s
test_other_archs (i686-unknown-linux-gnu)	1m 55s
test_features	39s
test_toolchains (1.70.0)	25s
test_features (default)	1m 51s
test_toolchains (nightly)	1m 46s
test_features (rayon)	58s
test_toolchains (beta)	1m 37s
test_features (avif)	1m 8s
test_features (bmp)	43s
test_features (dds)	40s
test_features (exr)	1m 1s
test_features (ff)	44s
test_features (gif)	43s
test_features (hdr)	44s
test_features (ico)	43s
test_features (jpeg)	33s
test_features (png)	44s
test_features (pnm)	34s
test_features (qoi)	39s
test_features (tga)	36s
test_features (tiff)	45s
test_features (webp)	39s
	32m 26s

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