Add YGErrata Enum (#1256)

Summary:
Pull Request resolved: https://github.com/facebook/yoga/pull/1256

X-link: https://github.com/facebook/react-native/pull/37076

This adds a `YGErrata` bitset enum matching the API and guarantees described in https://github.com/facebook/yoga/issues/1247.

It is hooked up in later diffs. There are a couple of `YGExperimentalFeature` values that belong here, but keeping the current options means that the default `YGErrataNone` corresponds to existing default behavior, letting us stage the series of changes as:
1. Implement errata API
2. Update internal Yoga users we want to de-risk to `YGErrataClassic` or `YGErrataAll` (if setting `UseLegacyStretchBehaviour`)
3. Add new errata, changing Yoga defaults to be conformant, while letting internal apps opt into compatibility modes pending experimentation.

I also added a macro to let C++ users of Yoga perform bitwise operations on the enum without casting (already available for C users).

Reviewed By: rshest

Differential Revision: D45254098

fbshipit-source-id: d4b61271a8018f548f2d9d8c953db4b121a502d1

csharp/Facebook.Yoga/YogaErrata.cs

@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+// @generated by enums.py
+
+namespace Facebook.Yoga
+{
+    [System.Flags]
+    public enum YogaErrata
+    {
+        None = 0,
+        StretchFlexBasis = 1,
+        All = 2147483647,
+        Classic = 2147483646,
+    }
+}