Migrate SystemClock and JavaScriptException to Kotlin (facebook#43732)

Summary:
Pull Request resolved: facebook#43732

## Changelog:
[Internal] -

As in the title.

Reviewed By: cortinico

Differential Revision: D55574532

fbshipit-source-id: bffa17a4be0f881a574988c34d9446f6392c816c

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

@@ -1687,7 +1687,7 @@ public abstract interface class com/facebook/react/common/HasJavascriptException
 public class com/facebook/react/common/JavascriptException : java/lang/RuntimeException, com/facebook/react/common/HasJavascriptExceptionMetadata {
 	public fun <init> (Ljava/lang/String;)V
 	public fun getExtraDataAsJson ()Ljava/lang/String;
-	public fun setExtraDataAsJson (Ljava/lang/String;)Lcom/facebook/react/common/JavascriptException;
+	public final fun setExtraDataAsJson (Ljava/lang/String;)Lcom/facebook/react/common/JavascriptException;
 }
 
 public final class com/facebook/react/common/LifecycleState : java/lang/Enum {
@@ -1771,11 +1771,11 @@ public abstract interface class com/facebook/react/common/SurfaceDelegateFactory
 	public abstract fun createSurfaceDelegate (Ljava/lang/String;)Lcom/facebook/react/common/SurfaceDelegate;
 }
 
-public class com/facebook/react/common/SystemClock {
-	public fun <init> ()V
-	public static fun currentTimeMillis ()J
-	public static fun nanoTime ()J
-	public static fun uptimeMillis ()J
+public final class com/facebook/react/common/SystemClock {
+	public static final field INSTANCE Lcom/facebook/react/common/SystemClock;
+	public static final fun currentTimeMillis ()J
+	public static final fun nanoTime ()J
+	public static final fun uptimeMillis ()J
 }
 
 public abstract interface annotation class com/facebook/react/common/annotations/DeprecatedInNewArchitecture : java/lang/annotation/Annotation {

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/common/JavascriptException.kt

@@ -0,0 +1,27 @@
+/*
+ * 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.common
+
+import com.facebook.proguard.annotations.DoNotStrip
+
+/**
+ * A JS exception that was propagated to native. In debug mode, these exceptions are normally shown
+ * to developers in a redbox.
+ */
+@DoNotStrip
+public open class JavascriptException(jsStackTrace: String) :
+    RuntimeException(jsStackTrace), HasJavascriptExceptionMetadata {
+  private var extraDataAsJson: String? = null
+
+  override fun getExtraDataAsJson(): String? = extraDataAsJson
+
+  public fun setExtraDataAsJson(extraDataAsJson: String?): JavascriptException {
+    this.extraDataAsJson = extraDataAsJson
+    return this
+  }
+}

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/common/SystemClock.kt

@@ -0,0 +1,22 @@
+/*
+ * 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.common
+
+import android.os.SystemClock
+
+/**
+ * Detour for System.currentTimeMillis and System.nanoTime calls so that they can be mocked out in
+ * tests.
+ */
+public object SystemClock {
+  @JvmStatic public fun currentTimeMillis(): Long = System.currentTimeMillis()
+
+  @JvmStatic public fun nanoTime(): Long = System.nanoTime()
+
+  @JvmStatic public fun uptimeMillis(): Long = SystemClock.uptimeMillis()
+}