Add traits for color schemes from traditional color theory #291

Job	Run time
Compile and test MSRV (ubuntu-latest)	6m 6s
Quick check (beta)	1m 40s
Compile and test MSRV (macos-latest)	9m 22s
integration tests (ubuntu-latest)	28s
Compile and test MSRV (windows-latest)	9m 1s
Quick check (stable)	1m 36s
Miri tests	3m 9s
integration tests (macos-latest)	1m 22s
Quick check (nightly)	1m 44s
integration tests (windows-latest)	2m 49s
Test #[no_std]	21s
ci	1s
	37m 39s

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