Implement ImageEncoder for hdr where color type is Rgba32F #989

Job	Run time
build_benchmarks	59s
Fuzz targets (cargo-fuzz)	9m 10s
cargo-deny	33s
Fuzz targets (afl)	1m 53s
clippy	3m 13s
public_private_dependencies	22s
rustfmt	17s
test_avif	1m 54s
test_avif_decoding	1m 55s
test_big_endian	1m 25s
test_big_endian (default)	3m 15s
test_features	44s
test_toolchains (1.61.0)	4m 3s
test_big_endian (webp)	1m 45s
test_features (default)	2m 37s
test_toolchains (nightly)	1m 39s
test_big_endian (webp-encoder)	3m 34s
test_features (gif)	59s
verify_msrv	2m 59s
test_toolchains (beta)	2m 45s
test_features (jpeg)	1m 3s
test_features (png)	1m 4s
test_features (tiff)	1m 14s
test_features (ico)	58s
test_features (pnm)	50s
test_features (tga)	48s
test_features (webp)	56s
test_features (bmp)	53s
test_features (hdr)	49s
test_features (dxt)	50s
test_features (dds)	46s
test_features (farbfeld)	50s
test_features (openexr)	1m 10s
test_features (jpeg_rayon)	1m 17s
test_features (webp-encoder)	1m 23s
	1h 0m 52s

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