v0.0.1 of carbide

An unofficial Flutter port of the IBM Carbon Design System, built strictly on Flutter's base widgets (no Material, no Cupertino). Changelog excerpt: Initial public preview of Carbide— an unofficial Flutter port of the IBM Carbon Design System, built strictly on Flutter's base widgets (no Material, no Cupertino). ### Foundations - Color tokens and the four Carbon themes (White, Gray 10, Gray 90, Gray 100), with CarbonTheme, AnimatedCarbonTheme, and the CarbonLayercontextual layering model. - Typography (bundled IBM Plex Sans, Mono, and Serif), spacing/layout tokens, motion tokens, and the Carbon icon and pictogram sets. ### Compo[...]