Convert ReactFeatureFlags to Kotlin (#47260)

Summary:
Pull Request resolved: #47260

Convert ReactFeatureFlags to Kotlin

changeLog: [Android][Changed] Migrate ReactFeatureFlags to Kotlin

Reviewed By: shwanton, javache

Differential Revision: D65070217

fbshipit-source-id: 8939326c1e1e7cd634347a58123ad8c0795c309e

Author: mdvacca

packages/react-native/ReactAndroid/api/ReactAndroid.api

@@ -2025,9 +2025,9 @@ public final class com/facebook/react/common/network/OkHttpCallUtil {
 	public static final fun cancelTag (Lokhttp3/OkHttpClient;Ljava/lang/Object;)V
 }
 
-public class com/facebook/react/config/ReactFeatureFlags {
+public final class com/facebook/react/config/ReactFeatureFlags {
+	public static final field INSTANCE Lcom/facebook/react/config/ReactFeatureFlags;
 	public static field dispatchPointerEvents Z
-	public fun <init> ()V
 }
 
 public final class com/facebook/react/defaults/DefaultComponentsRegistry {

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/config/ReactFeatureFlags.java renamed to packages/react-native/ReactAndroid/src/main/java/com/facebook/react/config/ReactFeatureFlags.kt

@@ -5,22 +5,20 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-package com.facebook.react.config;
+package com.facebook.react.config
 
-import com.facebook.infer.annotation.Nullsafe;
-import com.facebook.proguard.annotations.DoNotStripAny;
+import com.facebook.proguard.annotations.DoNotStripAny
+import kotlin.jvm.JvmField
 
 /**
  * Hi there, traveller! This configuration class is not meant to be used by end-users of RN. It
  * contains mainly flags for features that are either under active development and not ready for
  * public consumption, or for use in experiments.
  *
- * <p>These values are safe defaults and should not require manual changes.
+ * These values are safe defaults and should not require manual changes.
  */
-@Nullsafe(Nullsafe.Mode.LOCAL)
-@Deprecated(since = "Use com.facebook.react.internal.featureflags.ReactNativeFeatureFlags instead.")
+@Deprecated("Use com.facebook.react.internal.featureflags.ReactNativeFeatureFlags instead.")
 @DoNotStripAny
-public class ReactFeatureFlags {
-
-  public static boolean dispatchPointerEvents = false;
+public object ReactFeatureFlags {
+  @JvmField public var dispatchPointerEvents: Boolean = false
 }