goToUnknownPage method
Navigates to an unknown page. Optionally clears all pages.
Implementation
@override
Future<void> goToUnknownPage([bool clearPages = false]) async {
if (clearPages) _activePages.clear();
final pageSettings = _buildPageSettings(notFoundRoute.name);
final routeDecoder = _getRouteDecoder(pageSettings);
_push(routeDecoder!);
}