Separate token group for common colors (both text and bg)

[nekitk]

For projects which don't have logical colors and use named absoulte colors (gray-100, gray-500, etc. like in Tailwind: https://tailwindcss.com/docs/customizing-colors).

Add token group colors — these colors could be used both in color and in background properties. Variable should be just --color-${name}.

Tweaks necessary:

• Add token group
• Support for new groupd in linting (currently only one group is searched for properties)
• Support for new group in autofixing

[nekitk]

Done in b86e868294bed46d7aee85bb0f91f7b5061e7fd6