Implement ImageEncoder for hdr where color type is Rgba32F #990

Job	Run time
build_benchmarks	1m 16s
Fuzz targets (afl)	1m 57s
Fuzz targets (cargo-fuzz)	6m 44s
cargo-deny	35s
clippy	3m 8s
public_private_dependencies	26s
test_avif	1m 54s
rustfmt	18s
test_avif_decoding	1m 55s
test_big_endian	1m 25s
test_features	51s
test_big_endian (default)	3m 3s
test_toolchains (1.61.0)	3m 37s
test_features (default)	1m 49s
test_toolchains (nightly)	1m 47s
test_big_endian (webp)	1m 56s
verify_msrv	3m 21s
test_features (gif)	53s
test_toolchains (beta)	2m 50s
test_big_endian (webp-encoder)	2m 57s
test_features (jpeg)	51s
test_features (png)	1m 25s
test_features (tiff)	1m 23s
test_features (ico)	1m 18s
test_features (pnm)	58s
test_features (tga)	48s
test_features (webp)	48s
test_features (bmp)	2m 37s
test_features (hdr)	57s
test_features (dxt)	44s
test_features (dds)	2m 47s
test_features (farbfeld)	45s
test_features (openexr)	1m 32s
test_features (jpeg_rayon)	1m 10s
test_features (webp-encoder)	1m 24s
	1h 2m 9s

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