Use ExtendedColorType when encoding #1242

Job	Run time
build_benchmarks	52s
test_avif_decoding	1m 39s
Fuzz targets (afl)	1m 56s
Fuzz targets (cargo-fuzz)	7m 8s
cargo-deny	24s
clippy	1m 31s
rustfmt	12s
public_private_dependencies	24s
test_other_archs (powerpc-unknown-linux-gnu)	4m 25s
test_features	26s
test_other_archs (i686-unknown-linux-gnu)	1m 40s
test_toolchains (1.63.0)	37s
test_features (default)	2m 12s
test_toolchains (nightly)	1m 44s
test_features (rayon)	30s
test_toolchains (beta)	1m 40s
test_features (avif)	1m 2s
test_features (bmp)	25s
test_features (dds)	27s
test_features (exr)	41s
test_features (ff)	23s
test_features (gif)	49s
test_features (hdr)	28s
test_features (ico)	37s
test_features (jpeg)	30s
test_features (png)	29s
test_features (pnm)	26s
test_features (qoi)	24s
test_features (tga)	24s
test_features (tiff)	30s
test_features (webp)	27s
	35m 22s

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