Add no-color-literals lint rule

.eslintrc

frontend/lint/eslint-rules/no-color-literals.js

frontend/src/metabase/auth/components/AuthScene.jsx

frontend/src/metabase/icon_paths.js

frontend/src/metabase/lib/ace/theme-metabase.js

frontend/src/metabase/lib/colors.js

frontend/src/metabase/lib/urls.js

.../src/metabase/visualizations/components/ChoroplethMap.jsx

frontend/test/.eslintrc

package.json