Add buck rule to generate Java library

Summary: Adds buck rule for generated code

Reviewed By: mdvacca, makovkastar

Differential Revision: D16338763

fbshipit-source-id: 6b238b3993cc110f009ad541cfa924d0d06d2fcb

packages/react-native-codegen/buck_tests/java/BooleanPropNativeComponentViewManager.java

@@ -0,0 +1,10 @@
+package com.facebook.react.uimanager;
+
+import android.view.ViewGroup;
+
+public class BooleanPropNativeComponentViewManager extends BaseViewManager
+    implements BooleanPropNativeComponentInterface {
+
+  @Override
+  public void setDisabled(ViewGroup view, boolean value) {}
+}