delete the message on storage server after receiving an unsend request

SessionMessagingKit/Sending & Receiving/MessageReceiver+Handling.swift

@@ -1,4 +1,5 @@
 import SignalCoreKit
+import SessionSnodeKit
 
 extension MessageReceiver {
 
@@ -230,6 +231,9 @@ extension MessageReceiver {
             if let incomingMessage = messageToDelete as? TSIncomingMessage, let notificationIdentifier = incomingMessage.notificationIdentifier, !notificationIdentifier.isEmpty {
                 SSKEnvironment.shared.notificationsManager!.cancelNotification(notificationIdentifier)
             }
+            if let serverHash = messageToDelete.serverHash {
+                SnodeAPI.deleteMessage(publicKey: author, serverHashes: [serverHash]).retainUntilComplete()
+            }
             messageToDelete.remove(with: transaction)
         }
     }