Add decoding hooks #1664

Job	Run time
build_benchmarks	38s
Fuzz targets (afl)	1m 22s
Fuzz targets (cargo-fuzz)	48s
cargo-deny	17s
cargo-semver-checks	34s
clippy	2m 5s
public_private_dependencies	23s
rustfmt	15s
test_avif_decoding	1m 27s
test_features	18s
test_other_archs (powerpc-unknown-linux-gnu)	1m 24s
test_features (default)	29s
test_toolchains (1.70.0)	24s
test_other_archs (i686-unknown-linux-gnu)	52s
test_features (rayon)	21s
test_toolchains (nightly)	31s
test_features (avif)	36s
test_toolchains (beta)	24s
test_features (bmp)	19s
test_features (dds)	14s
test_features (exr)	17s
test_features (ff)	17s
test_features (gif)	21s
test_features (hdr)	15s
test_features (ico)	15s
test_features (jpeg)	15s
test_features (png)	18s
test_features (pnm)	16s
test_features (qoi)	17s
test_features (tga)	18s
test_features (tiff)	17s
test_features (webp)	17s
	17m 4s

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