Move YGLogger into YGConfig and associate YGNodeRef with log events

Summary:
Moves the `YGLogger` into `YGConfig` and pass the `YGNodeRef` into the logger to be able to associate the log messages and assertions with the specific node.

Tackles facebook/yoga#530 and facebook/yoga#446
Closes https://github.com/facebook/yoga/pull/531

Reviewed By: astreet

Differential Revision: D4970149

Pulled By: emilsjolander

fbshipit-source-id: b7fcdaa273143ea2fa35861620b2e4d79f04f0af

csharp/tests/Facebook.Yoga/YogaConfigTest.cs

@@ -69,6 +69,7 @@ namespace Facebook.Yoga
             Assert.AreEqual(YogaFlexDirection.Row, node1.FlexDirection);
         }
 
+#if !UNITY_5_4_OR_NEWER
         public static void ForceGC()
         {
             YogaNodeTest.ForceGC();
@@ -132,5 +133,6 @@ namespace Facebook.Yoga
 
             return node;
         }
+#endif
     }
 }