Add warnings to deprecate UIManager.getViewManagerConfig method

Summary:
UIManager.getViewManagerConfig method is deprecated, use UIManager.hasViewManagerConfig instead

changelog: [Deprecated] UIManager.getViewManagerConfig method has been deprecated, use UIManager.hasViewManagerConfig instead.

Reviewed By: fkgozali

Differential Revision: D27983717

fbshipit-source-id: 982ecce20eb441c076f7c26d9a54ea13d93c2a31

Libraries/ReactNative/PaperUIManager.js

@@ -100,6 +100,9 @@ const UIManagerJS = {
     return getConstants();
   },
   getViewManagerConfig(viewManagerName: string): any {
+    console.warn(
+      'getViewManagerConfig is deprecated, use UIManager.hasViewManagerConfig instead.',
+    );
     return getViewManagerConfig(viewManagerName);
   },
   hasViewManagerConfig(viewManagerName: string): boolean {