Make color space optional in getAll() + colorSpace.equals() improvements

[LeaVerou]

This PR does two things:

1. Supports string ids in colorSpace.equals() (and adds JSDoc for the method)
2. Makes the color space optional in getAll().
   Not only does this make getAll() more consistent with the rest of the API, it also sets the stage for option 3 here: Precision lets scientific notation leak for small values #388 (comment) . As a side effect, it also implements a performance improvement when the color passed happens to be in the same color space as the one specified as it now goes through the same code path.

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[MysteryBlokHed]

The JavaScript changes LGTM, but the types should be changed to reflect that the space parameter is now optional:

color.js/types/src/getAll.d.ts

Lines 4 to 7 in 2f264bf

	export default function getAll (
	color: Color | ColorObject,
	space: string | ColorSpace
	): [number, number, number];

 export default function getAll (
 	color: Color | ColorObject,
-	space: string | ColorSpace
+	space?: string | ColorSpace
 ): [number, number, number];

[LeaVerou]

@MysteryBlokHed Yup, I was hoping that you or @jgerigmeyer would be kind enough to do that 😁