Implement ImageEncoder for hdr where color type is Rgba32F #988

Job	Run time
test_avif	1m 55s
test_toolchains (1.61.0)	3m 36s
test_toolchains (nightly)	3m 15s
build_benchmarks	1m 28s
Fuzz targets (afl)	1m 52s
Fuzz targets (cargo-fuzz)	7m 16s
test_toolchains (beta)	2m 23s
clippy	4m 4s
public_private_dependencies	23s
rustfmt	22s
test_avif_decoding	2m 1s
test_big_endian	1m 22s
test_big_endian (default)	4m 39s
test_features	46s
test_big_endian (webp)	1m 43s
cargo-deny	25s
test_features (default)	2m 25s
test_big_endian (webp-encoder)	3m 11s
test_features (gif)	1m 9s
test_features (jpeg)	50s
verify_msrv	3m 28s
test_features (png)	55s
test_features (tiff)	57s
test_features (ico)	1m 12s
test_features (pnm)	1m 5s
test_features (tga)	52s
test_features (webp)	54s
test_features (bmp)	52s
test_features (hdr)	1m 7s
test_features (dxt)	1m 0s
test_features (dds)	1m 5s
test_features (farbfeld)	48s
test_features (openexr)	1m 22s
test_features (jpeg_rayon)	57s
test_features (webp-encoder)	1m 22s
	1h 3m 1s

Provide feedback