Expose box sizing getters and setters in Yoga (#1701)

Summary:
Pull Request resolved: https://github.com/facebook/yoga/pull/1701

X-link: https://github.com/facebook/react-native/pull/46630

I would like to write some tests for box sizing that will drive a lot of my development as I implement content box. To do that, I need this publicly exposed. Obviously not that ideal since this currently does not do anything. Maybe we can name the value in such a way that its clear it is in development?

Changelog: [Internal]

Reviewed By: NickGerleman

Differential Revision: D63135970

fbshipit-source-id: 7520823bf925364eae45341531e012e80ec92284

java/com/facebook/yoga/YogaNode.java

@@ -88,6 +88,10 @@ public abstract class YogaNode implements YogaProps {
 
   public abstract void setPositionType(YogaPositionType positionType);
 
+  public abstract YogaBoxSizing getBoxSizing();
+
+  public abstract void setBoxSizing(YogaBoxSizing boxSizing);
+
   public abstract YogaWrap getWrap();
 
   public abstract void setWrap(YogaWrap flexWrap);