Migrate YogaNodeJNIBase.java to Kotlin

Summary:
Migrate YogaNodeJNIBase.java to YogaNodeJNIBase.kt, the last hand-written Java source file in the Yoga core library. This required converting all function overrides to Kotlin property overrides where the abstract YogaNode class declares them as val/var properties. Also changed nativePointer visibility in YogaConfigJNIBase from protected to internal to maintain same-module access that Java protected provided via package access.

Changelog:
[Internal] -

Differential Revision: D104666335

Author: cortinico

java/com/facebook/yoga/YogaConfigJNIBase.kt

@@ -16,7 +16,7 @@ import com.facebook.yoga.YogaNative.jni_YGConfigSetPointScaleFactorJNI
 import com.facebook.yoga.YogaNative.jni_YGConfigSetUseWebDefaultsJNI
 
 public abstract class YogaConfigJNIBase
-private constructor(@JvmField protected var nativePointer: Long) : YogaConfig() {
+private constructor(@JvmField internal var nativePointer: Long) : YogaConfig() {
   private var _logger: YogaLogger? = null
 
   init {