Messenger - restore from backup

XXMessengerClient

• Add MessengerRestoreBackup function wrapper
  • Restore CMix and UserDiscovery from backup
  • Return restored params and contacts
• Add MessengerIsListeningForMessages function

xx-messenger example

• Restore backup from file
• Refactor app startup

Sources/XXMessengerClient/Messenger/Functions/MessengerConnect.swift

@@ -25,6 +25,7 @@ extension MessengerConnect {
         identity: try cMix.makeReceptionIdentity(legacy: true),
         e2eParamsJSON: env.getE2EParams()
       ))
+      env.isListeningForMessages.set(false)
     }
   }
 }