Kotlinify NativeKind (#43775)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/43775

Changelog: [Internal]

As part of the Sustainability Week (see [post](https://fb.workplace.com/groups/251759413609061/permalink/742797531171911/)).

Reviewed By: cortinico

Differential Revision: D55640039

fbshipit-source-id: 5e8f395db0b7010e9a8b225a472db3bb46459d00

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/uimanager/NativeKind.kt

@@ -5,16 +5,13 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-package com.facebook.react.uimanager;
-
-import com.facebook.infer.annotation.Nullsafe;
+package com.facebook.react.uimanager
 
 // Common conditionals:
 //   - `kind == PARENT` checks whether the node can host children in the native tree.
 //   - `kind != NONE` checks whether the node appears in the native tree.
 
-@Nullsafe(Nullsafe.Mode.LOCAL)
-public enum NativeKind {
+public enum class NativeKind {
   // Node is in the native hierarchy and the HierarchyOptimizer should assume it can host children
   // (e.g. because it's a ViewGroup). Note that it's okay if the node doesn't support children. When
   // the HierarchyOptimizer generates children manipulation commands for that node, the
@@ -24,5 +21,5 @@ public enum NativeKind {
   // because it isn't a ViewGroup). Consequently, its children need to be hosted by an ancestor.
   LEAF,
   // Node is not in the native hierarchy.
-  NONE
+  NONE,
 }