Bug 1815186 - Add ColorTo to InspectorUtils to convert color to other color...

Bug 1815186 - Add ColorTo to InspectorUtils to convert color to other color spaces. r=emilio,layout-reviewers,supply-chain-reviewers

This will allow calling `InspectorUtils.ColorTo("red", "lab")` and
receive `{color: "lab(54.3 80.8 69.9)", components: [54.3, 80.8, 69.9, 1.0], adjusted: false}`.

The adjusted value is always "false", because gamut checking and mapping
is not supported at the moment. See:
https://bugzilla.mozilla.org/show_bug.cgi?id=1823363

Differential Revision: https://phabricator.services.mozilla.com/D169942