Migrate JSCInstance to Kotlin (facebook#43750)

Summary:
Pull Request resolved: facebook#43750

Changelog: [Internal]

Differential Revision: D55610929

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

@@ -3645,9 +3645,12 @@ public class com/facebook/react/runtime/CoreReactPackage$$ReactModuleInfoProvide
 	public fun getReactModuleInfos ()Ljava/util/Map;
 }
 
-public class com/facebook/react/runtime/JSCInstance : com/facebook/react/runtime/JSRuntimeFactory {
+public final class com/facebook/react/runtime/JSCInstance : com/facebook/react/runtime/JSRuntimeFactory {
+	public static final field Companion Lcom/facebook/react/runtime/JSCInstance$Companion;
 	public fun <init> ()V
-	protected static fun initHybrid ()Lcom/facebook/jni/HybridData;
+}
+
+public final class com/facebook/react/runtime/JSCInstance$Companion {
 }
 
 public abstract class com/facebook/react/runtime/JSRuntimeFactory {

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/runtime/JSCInstance.kt

@@ -0,0 +1,24 @@
+/*
+ * 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.
+ */
+
+package com.facebook.react.runtime
+
+import com.facebook.jni.HybridData
+import com.facebook.jni.annotations.DoNotStrip
+import com.facebook.soloader.SoLoader
+import com.facebook.soloader.annotation.SoLoaderLibrary
+
+@SoLoaderLibrary("jscinstance")
+public class JSCInstance constructor() : JSRuntimeFactory(initHybrid()) {
+  public companion object {
+    init {
+      SoLoader.loadLibrary("jscinstance")
+    }
+
+    @DoNotStrip protected external fun initHybrid(): HybridData
+  }
+}