message: feat(runtime): add root property to classes map type
diff: export type StateValue = boolean | number | string | undefined;
  +export interface ClassesMap {
  + root: string;
  + [className: string]: string;
  +}
  +
  export interface StateMap {
  [stateName: string]: StateValue;
  }
  @@ -15,7 +20,7 @@ export interface InheritedAttributes {
  }
  export interface StylableExports {
  - classes: Record<string, string>;
  + classes: ClassesMap;
  keyframes: Record<string, string>;
  vars: Record<string, string>;
  stVars: Record<string, string>;
  