Add ImageDecoder::orientation method #1580

Job	Run time
Fuzz targets (afl)	2m 8s
build_benchmarks	46s
Fuzz targets (cargo-fuzz)	53s
cargo-deny	17s
cargo-semver-checks	27s
clippy	2m 5s
public_private_dependencies	24s
rustfmt	13s
test_avif_decoding	1m 21s
test_features	15s
test_other_archs (powerpc-unknown-linux-gnu)	2m 6s
test_features (default)	1m 45s
test_toolchains (1.67.1)	41s
test_other_archs (i686-unknown-linux-gnu)	1m 15s
test_features (rayon)	35s
test_toolchains (nightly)	1m 8s
test_features (avif)	1m 2s
test_toolchains (beta)	1m 12s
test_features (bmp)	28s
test_features (dds)	19s
test_features (exr)	41s
test_features (ff)	23s
test_features (gif)	20s
test_features (hdr)	17s
test_features (ico)	37s
test_features (jpeg)	25s
test_features (png)	29s
test_features (pnm)	25s
test_features (qoi)	25s
test_features (tga)	17s
test_features (tiff)	24s
test_features (webp)	25s
	24m 28s

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