feat(callkit): Add CallKit service for native call UI and permissions

ios/Podfile.lock

@@ -4,6 +4,7 @@ PODS:
     - FlutterMacOS
   - connectivity_plus (0.0.1):
     - Flutter
+  - CryptoSwift (1.8.4)
   - DKImagePickerController/Core (4.3.9):
     - DKImagePickerController/ImageDataManager
     - DKImagePickerController/Resource
@@ -39,6 +40,9 @@ PODS:
     - DKImagePickerController/PhotoGallery
     - Flutter
   - Flutter (1.0.0)
+  - flutter_callkit_incoming (0.0.1):
+    - CryptoSwift
+    - Flutter
   - flutter_local_notifications (0.0.1):
     - Flutter
   - flutter_native_splash (2.4.3):
@@ -98,6 +102,7 @@ DEPENDENCIES:
   - connectivity_plus (from `.symlinks/plugins/connectivity_plus/ios`)
   - file_picker (from `.symlinks/plugins/file_picker/ios`)
   - Flutter (from `Flutter`)
+  - flutter_callkit_incoming (from `.symlinks/plugins/flutter_callkit_incoming/ios`)
   - flutter_local_notifications (from `.symlinks/plugins/flutter_local_notifications/ios`)
   - flutter_native_splash (from `.symlinks/plugins/flutter_native_splash/ios`)
   - flutter_secure_storage (from `.symlinks/plugins/flutter_secure_storage/ios`)
@@ -119,6 +124,7 @@ DEPENDENCIES:
 
 SPEC REPOS:
   trunk:
+    - CryptoSwift
     - DKImagePickerController
     - DKPhotoGallery
     - onnxruntime-c
@@ -135,6 +141,8 @@ EXTERNAL SOURCES:
     :path: ".symlinks/plugins/file_picker/ios"
   Flutter:
     :path: Flutter
+  flutter_callkit_incoming:
+    :path: ".symlinks/plugins/flutter_callkit_incoming/ios"
   flutter_local_notifications:
     :path: ".symlinks/plugins/flutter_local_notifications/ios"
   flutter_native_splash:
@@ -175,10 +183,12 @@ EXTERNAL SOURCES:
 SPEC CHECKSUMS:
   audioplayers_darwin: 4f9ca89d92d3d21cec7ec580e78ca888e5fb68bd
   connectivity_plus: cb623214f4e1f6ef8fe7403d580fdad517d2f7dd
+  CryptoSwift: e64e11850ede528a02a0f3e768cec8e9d92ecb90
   DKImagePickerController: 946cec48c7873164274ecc4624d19e3da4c1ef3c
   DKPhotoGallery: b3834fecb755ee09a593d7c9e389d8b5d6deed60
   file_picker: a0560bc09d61de87f12d246fc47d2119e6ef37be
   Flutter: cabc95a1d2626b1b06e7179b784ebcf0c0cde467
+  flutter_callkit_incoming: cb8138af67cda6dd981f7101a5d709003af21502
   flutter_local_notifications: a5a732f069baa862e728d839dd2ebb904737effb
   flutter_native_splash: c32d145d68aeda5502d5f543ee38c192065986cf
   flutter_secure_storage: 1ed9476fba7e7a782b22888f956cce43e2c62f13

ios/Runner/Info.plist

@@ -87,11 +87,13 @@
 			</dict>
 		</array>
 		<!-- Background Modes -->
-		<key>UIBackgroundModes</key>
-		<array>
-			<string>audio</string>
-			<string>processing</string>
-		</array>
+	<key>UIBackgroundModes</key>
+	<array>
+		<string>audio</string>
+		<string>remote-notification</string>
+		<string>processing</string>
+		<string>voip</string>
+	</array>
 		<!-- Background Task Identifiers -->
 		<key>BGTaskSchedulerPermittedIdentifiers</key>
 		<array>