Pretty-print Native AnimatedNode values

Summary:
For debugging, add prettyPrint method to AnimatedNode classes.

Changelog: [Internal]

Reviewed By: shergin

Differential Revision: D22752292

fbshipit-source-id: ce1f08fc4fd97f38629dd82151c6ea762026c7c9

ReactAndroid/src/main/java/com/facebook/react/animated/AdditionAnimatedNode.java

@@ -43,4 +43,14 @@ import com.facebook.react.bridge.ReadableMap;
       }
     }
   }
+
+  @Override
+  public String prettyPrint() {
+    return "AdditionAnimatedNode["
+        + mTag
+        + "]: input nodes: "
+        + (mInputNodes != null ? mInputNodes.toString() : "null")
+        + " - super: "
+        + super.prettyPrint();
+  }
 }