Added NTSubDescriptor files and SKSubDescriptor interface

Summary: Added NTSubDescriptor file which implements the SKSubDescriptor interface to pass all NT specific data to the Layout Component Descriptor.

Reviewed By: jknoxville

Differential Revision: D12840392

fbshipit-source-id: bff295e13e8531456428424b7e073aefe7e1ced4

iOS/Plugins/FlipperKitLayoutPlugin/FlipperKitLayoutComponentKitSupport/SKSubDescriptor.mm

@@ -0,0 +1,27 @@
+/*
+ *  Copyright (c) 2018-present, Facebook, Inc.
+ *
+ *  This source code is licensed under the MIT license found in the LICENSE
+ *  file in the root directory of this source tree.
+ *
+ */
+#if FB_SONARKIT_ENABLED
+
+#import "SKSubDescriptor.h"
+#import "SKComponentLayoutWrapper.h"
+
+@implementation SKSubDescriptor
+{
+}
+
+- (NSDictionary<NSString *, NSObject *> *)getDataForNode:(SKComponentLayoutWrapper *)node {
+  return @{};
+}
+
+- (NSString *)getName {
+  return @"";
+}
+
+@end
+
+#endif