Invitation Notification design improvements and navigation (#1091)

* invitation notification

* handling navigation to the invite view

* improved invite notifications

# Conflicts:
#	NSE/Sources/NotificationServiceExtension.swift

* improved the design

* improved the navigation handling on iPad vs iPhone

* comment

* code improvement

* better doc

ElementX/Sources/Application/AppCoordinator.swift

@@ -155,8 +155,15 @@ class AppCoordinator: AppCoordinatorProtocol, AuthenticationCoordinatorDelegate,
         }
         
         // Handle here the account switching when available
-        
-        handleAppRoute(.room(roomID: roomID))
+
+        switch content.categoryIdentifier {
+        case NotificationConstants.Category.message:
+            handleAppRoute(.room(roomID: roomID))
+        case NotificationConstants.Category.invite:
+            handleAppRoute(.invites)
+        default:
+            break
+        }
     }
     
     func handleInlineReply(_ service: NotificationManagerProtocol, content: UNNotificationContent, replyText: String) async {

ElementX/Sources/Application/FlowCoordinatorProtocol.swift

@@ -19,4 +19,5 @@ import Foundation
 @MainActor
 protocol FlowCoordinatorProtocol {
     func handleAppRoute(_ appRoute: AppRoute, animated: Bool)
+    func clearRoute(animated: Bool)
 }

ElementX/Sources/Application/Navigation/AppRouter.swift

@@ -22,6 +22,7 @@ enum AppRoute {
     case roomList
     case room(roomID: String)
     case roomDetails(roomID: String)
+    case invites
 }
 
 struct AppRouterManager {