feat: integrate Firebase Messaging for push notifications; update AppDelegate and add Info.plist for widget support

ios/App/App/AppDelegate.swift

@@ -1,6 +1,7 @@
 import UIKit
 import Capacitor
-
+import FirebaseCore
+import FirebaseMessaging
 @UIApplicationMain
 class AppDelegate: UIResponder, UIApplicationDelegate {
 
@@ -8,6 +9,7 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
 
     func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
         // Override point for customization after application launch.
+        FirebaseApp.configure()
         return true
     }
 
@@ -46,10 +48,17 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
         return ApplicationDelegateProxy.shared.application(application, continue: userActivity, restorationHandler: restorationHandler)
     }
     func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
-      NotificationCenter.default.post(name: .capacitorDidRegisterForRemoteNotifications, object: deviceToken)
+    Messaging.messaging().apnsToken = deviceToken
+    Messaging.messaging().token(completion: { (token, error) in
+        if let error = error {
+            NotificationCenter.default.post(name: .capacitorDidFailToRegisterForRemoteNotifications, object: error)
+        } else if let token = token {
+            NotificationCenter.default.post(name: .capacitorDidRegisterForRemoteNotifications, object: token)
+        }
+    })
     }
 
     func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error) {
-      NotificationCenter.default.post(name: .capacitorDidFailToRegisterForRemoteNotifications, object: error)
+    NotificationCenter.default.post(name: .capacitorDidFailToRegisterForRemoteNotifications, object: error)
     }
 }