Support reload in ReactDelegate (#43521)

Summary:
Pull Request resolved: #43521

Changelog:
[Android] [Added] - Support reload() in ReactDelegate

Reviewed By: cortinico

Differential Revision: D54967602

fbshipit-source-id: adfa200cabcbecf9507775ac38f17c9d01b2671a

Author: arushikesarwani94

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

@@ -158,6 +158,7 @@ public class com/facebook/react/ReactDelegate {
 	public fun onKeyLongPress (I)Z
 	public fun onNewIntent (Landroid/content/Intent;)Z
 	public fun onWindowFocusChanged (Z)V
+	public fun reload ()V
 	public fun shouldShowDevMenuOrReload (ILandroid/view/KeyEvent;)Z
 }
 

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/ReactDelegate.java

@@ -225,6 +225,13 @@ public boolean onKeyLongPress(int keyCode) {
     return false;
   }
 
+  public void reload() {
+    DevSupportManager devSupportManager = getDevSupportManager();
+    if (devSupportManager != null) {
+      devSupportManager.handleReloadJS();
+    }
+  }
+
   public void loadApp() {
     loadApp(mMainComponentName);
   }