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

enums.py

@@ -4,7 +4,6 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
-import math
 import os
 
 ENUMS = {
@@ -34,6 +33,7 @@ ENUMS = {
     "PositionType": ["Static", "Relative", "Absolute"],
     "Display": ["Flex", "None"],
     "Wrap": ["NoWrap", "Wrap", "WrapReverse"],
+    "BoxSizing": ["ContentBox", "BorderBox"],
     "MeasureMode": ["Undefined", "Exactly", "AtMost"],
     "Dimension": ["Width", "Height"],
     "Edge": [