Undeprecate Config setting APIs (#1251)

Summary:
Pull Request resolved: https://github.com/facebook/yoga/pull/1251

X-link: https://github.com/facebook/react-native/pull/36990

YGNode::setConfig was deprecated as part of D15416474 in an apparent goal to remove config pointers per-Node.

While I don't know the history of the motivation here, these config pointers were never removed, and we will be doubling down on per-node configs for StrictLayout, so we will want to undeprecate this.

This also exposes functions to the public C ABI, but I didn't spend the effort to create language projections for it.

Changelog: [Internal]

Reviewed By: rshest

Differential Revision: D45133646

fbshipit-source-id: 2bb15c4825717793529cdad8542447d11e723e35

yoga/YGNode.h

@@ -16,7 +16,6 @@
 #include "YGConfig.h"
 #include "YGLayout.h"
 #include "YGStyle.h"
-#include "YGMacros.h"
 #include "Yoga-internal.h"
 
 YGConfigRef YGConfigGetDefault();
@@ -307,7 +306,7 @@ public:
 
   // TODO: rvalue override for setChildren
 
-  YG_DEPRECATED void setConfig(YGConfigRef config) { config_ = config; }
+  void setConfig(YGConfigRef config) { config_ = config; }
 
   void setDirty(bool isDirty);
   void setLayoutLastOwnerDirection(YGDirection direction);