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

Examples/xx-messenger/Sources/AppFeature/AppEnvironment+Live.swift

@@ -111,11 +111,6 @@ extension AppEnvironment {
         HomeEnvironment(
           messenger: messenger,
           dbManager: dbManager,
-          authHandler: authHandler,
-          messageListener: .live(
-            messenger: messenger,
-            db: dbManager.getDB
-          ),
           mainQueue: mainQueue,
           bgQueue: bgQueue,
           register: {