applyRoutes method
Applies the routes from this Controller to some router.
Implementation
Future<String> applyRoutes(
  Router<RequestHandler> router,
  Reflector reflector,
) async {
  // Load global expose decl
  var classMirror = reflector.reflectClass(runtimeType)!;
  var exposeDecl = findExpose(reflector);
  if (exposeDecl == null) {
    throw Exception('All controllers must carry an @Expose() declaration.');
  }
  var routable = Routable();
  _mountPoint = router.mount(exposeDecl.path, routable);
  //_mountPoint = m;
  var typeMirror = reflector.reflectType(runtimeType);
  // Pre-reflect methods
  var instanceMirror = reflector.reflectInstance(this);
  final handlers = <RequestHandler>[...exposeDecl.middleware, ...middleware];
  final routeBuilder = _routeBuilder(
    reflector,
    instanceMirror,
    routable,
    handlers,
  );
  await configureRoutes(routable);
  classMirror.declarations.forEach(routeBuilder);
  // Return the name.
  var result = exposeDecl.as?.isNotEmpty == true
      ? exposeDecl.as
      : typeMirror!.name;
  return Future.value(result);
}