fix: cocoapods APN customers app not compiling (#414)

Apps/CocoaPods-FCM/Podfile

@@ -11,6 +11,10 @@ target 'test cocoapods' do
   pod 'CustomerIOMessagingInApp', :path => sdk_local_path
   pod 'CustomerIOMessagingPushFCM', :path => sdk_local_path
 
+  # Adding APN for internal testing, only. Code from this pod is not used at runtime. 
+  # We need to confirm that cocoapods customers can compile their apps with this pod installed. 
+  pod 'CustomerIOMessagingPushAPN', :path => sdk_local_path
+
   # The "CustomerIOMessagingPushFCM" SDK installs the FCM SDK for you, defaulting to the latest version. 
   # If your app needs to use a specific version of the FCM SDK, you can add the line below to your app's Podfile 
   # and the version you specify will override the version in the "CustomerIOMessagingPushFCM" SDK. 
@@ -28,4 +32,8 @@ target 'Rich Push Notification Service Extension' do
   pod 'CustomerIOTracking', :path => sdk_local_path
   pod 'CustomerIOMessagingPush', :path => sdk_local_path
   pod 'CustomerIOMessagingPushFCM', :path => sdk_local_path
+
+  # Adding APN for internal testing, only. Code from this pod is not used at runtime. 
+  # We need to confirm that cocoapods customers can compile their apps with this pod installed. 
+  pod 'CustomerIOMessagingPushAPN', :path => sdk_local_path
 end 

Sources/MessagingPushAPN/MessagingPushAPN+PushConfigs.swift

@@ -2,13 +2,15 @@ import Foundation
 import UIKit
 
 extension MessagingPushAPN {
+    @available(iOSApplicationExtension, unavailable)
     func setupAutoFetchDeviceToken() {
         // Swizzle method `didRegisterForRemoteNotificationsWithDeviceToken`
         swizzleDidRegisterForRemoteNotifications()
         // Register for push notifications to invoke`didRegisterForRemoteNotificationsWithDeviceToken` method
         UIApplication.shared.registerForRemoteNotifications()
     }
 
+    @available(iOSApplicationExtension, unavailable)
     private func swizzleDidRegisterForRemoteNotifications() {
         let appDelegate = UIApplication.shared.delegate
         let appDelegateClass: AnyClass? = object_getClass(appDelegate)