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

Closes #14509

modules/@angular/router/src/index.ts

@@ -14,6 +14,7 @@ export {RouterOutlet} from './directives/router_outlet';
 export {CanActivate, CanActivateChild, CanDeactivate, CanLoad, Resolve} from './interfaces';
 export {DetachedRouteHandle, RouteReuseStrategy} from './route_reuse_strategy';
 export {Event, NavigationCancel, NavigationEnd, NavigationError, NavigationExtras, NavigationStart, Router, RoutesRecognized} from './router';
+export {ROUTES} from './router_config_loader';
 export {ExtraOptions, ROUTER_CONFIGURATION, ROUTER_INITIALIZER, RouterModule, provideRoutes} from './router_module';
 export {RouterOutletMap} from './router_outlet_map';
 export {NoPreloading, PreloadAllModules, PreloadingStrategy, RouterPreloader} from './router_preloader';
@@ -22,4 +23,5 @@ export {PRIMARY_OUTLET, Params} from './shared';
 export {UrlHandlingStrategy} from './url_handling_strategy';
 export {DefaultUrlSerializer, UrlSegment, UrlSegmentGroup, UrlSerializer, UrlTree} from './url_tree';
 export {VERSION} from './version';
+
 export * from './private_export'

modules/@angular/router/src/router_config_loader.ts

@@ -18,6 +18,7 @@ import {flatten, wrapIntoObservable} from './utils/collection';
 
 
 /**
+ * @docsNotRequired
  * @experimental
  */
 export const ROUTES = new InjectionToken<Route[][]>('ROUTES');