TF-1812 Handle add sending email to queue in work manager

(cherry picked from commit c5d89665f525550949bf4e694133ce5ea2777846)

ios/Podfile.lock

@@ -172,6 +172,8 @@ PODS:
   - SwiftyGif (5.4.4)
   - url_launcher_ios (0.0.1):
     - Flutter
+  - workmanager (0.0.1):
+    - Flutter
 
 DEPENDENCIES:
   - better_open_file (from `.symlinks/plugins/better_open_file/ios`)
@@ -198,6 +200,7 @@ DEPENDENCIES:
   - share_plus (from `.symlinks/plugins/share_plus/ios`)
   - shared_preferences_foundation (from `.symlinks/plugins/shared_preferences_foundation/ios`)
   - url_launcher_ios (from `.symlinks/plugins/url_launcher_ios/ios`)
+  - workmanager (from `.symlinks/plugins/workmanager/ios`)
 
 SPEC REPOS:
   trunk:
@@ -270,6 +273,8 @@ EXTERNAL SOURCES:
     :path: ".symlinks/plugins/shared_preferences_foundation/ios"
   url_launcher_ios:
     :path: ".symlinks/plugins/url_launcher_ios/ios"
+  workmanager:
+    :path: ".symlinks/plugins/workmanager/ios"
 
 SPEC CHECKSUMS:
   AppAuth: 8fca6b5563a5baef2c04bee27538025e4ceb2add
@@ -315,6 +320,7 @@ SPEC CHECKSUMS:
   shared_preferences_foundation: 986fc17f3d3251412d18b0265f9c64113a8c2472
   SwiftyGif: 93a1cc87bf3a51916001cf8f3d63835fb64c819f
   url_launcher_ios: 08a3dfac5fb39e8759aeb0abbd5d9480f30fc8b4
+  workmanager: 0afdcf5628bbde6924c21af7836fed07b42e30e6
 
 PODFILE CHECKSUM: e209bf81fb4facf3f68c43dbffa0b2d05ff63db0
 

ios/Runner/AppDelegate.swift

@@ -20,6 +20,8 @@ import workmanager
         /// Register the app's plugins in the context of a normal run
         AppDelegate.registerPlugins(with: self)
         
+        UNUserNotificationCenter.current().delegate = self
+        
         if #available(iOS 10.0, *) {
             UNUserNotificationCenter.current().delegate = self as UNUserNotificationCenterDelegate
         }
@@ -91,4 +93,9 @@ import workmanager
         return URL(string: "ShareMedia-\(appDomain)://dataUrl=\(sharedKey)#text")
     }
     
+    override func userNotificationCenter(_ center: UNUserNotificationCenter,
+                                         willPresent notification: UNNotification,
+                                         withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
+        completionHandler(.alert) // shows banner even if app is in foreground
+    }
 }