Hdr encoder trait impl #986

Job	Run time
test_big_endian	1m 26s
test_big_endian (default)	3m 5s
build_benchmarks	1m 5s
test_big_endian (webp)	1m 43s
Fuzz targets (afl)	2m 16s
test_features	46s
test_big_endian (webp-encoder)	3m 5s
test_features (default)	1m 34s
Fuzz targets (cargo-fuzz)	7m 9s
test_features (gif)	50s
test_features (jpeg)	1m 0s
clippy	3m 56s
public_private_dependencies	20s
test_avif	2m 17s
test_features (png)	1m 0s
test_features (tiff)	1m 8s
test_avif_decoding	1m 56s
test_features (ico)	1m 4s
test_toolchains (1.61.0)	3m 16s
test_features (pnm)	47s
test_toolchains (nightly)	2m 26s
cargo-deny	35s
test_features (tga)	58s
test_toolchains (beta)	2m 0s
test_features (webp)	49s
test_features (bmp)	50s
rustfmt	23s
test_features (hdr)	46s
verify_msrv	3m 20s
test_features (dxt)	44s
test_features (dds)	1m 0s
test_features (farbfeld)	48s
test_features (openexr)	1m 9s
test_features (jpeg_rayon)	1m 0s
test_features (webp-encoder)	1m 25s
	57m 56s

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