Add ImageDecoder::orientation method #1601

Job	Run time
test_avif_decoding	1m 28s
test_features	40s
test_features (default)	1m 48s
build_benchmarks	43s
Fuzz targets (afl)	1m 59s
test_features (rayon)	34s
Fuzz targets (cargo-fuzz)	56s
cargo-deny	18s
test_features (avif)	59s
test_features (bmp)	35s
cargo-semver-checks	21s
public_private_dependencies	22s
test_features (dds)	34s
rustfmt	6s
test_features (exr)	45s
test_other_archs (powerpc-unknown-linux-gnu)	2m 34s
test_features (ff)	30s
test_toolchains (1.67.1)	40s
test_other_archs (i686-unknown-linux-gnu)	1m 29s
test_features (gif)	46s
test_toolchains (nightly)	1m 12s
test_toolchains (beta)	1m 33s
test_features (hdr)	33s
test_features (ico)	40s
clippy	2m 6s
test_features (jpeg)	35s
test_features (png)	43s
test_features (pnm)	30s
test_features (qoi)	33s
test_features (tga)	28s
test_features (tiff)	37s
test_features (webp)	33s
	28m 10s

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