build: produce metadata bundles for @angular modules (#14509)

Closes #14509

tools/public_api_guard/router/index.d.ts

@@ -345,6 +345,9 @@ export declare class RouterStateSnapshot extends Tree<ActivatedRouteSnapshot> {
 /** @stable */
 export declare type Routes = Route[];
 
+/** @experimental */
+export declare const ROUTES: InjectionToken<Route[][]>;
+
 /** @stable */
 export declare class RoutesRecognized {
     id: number;