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

@@ -95,7 +95,12 @@ extension AppEnvironment {
         )
       },
       restore: {
-        RestoreEnvironment()
+        RestoreEnvironment(
+          messenger: messenger,
+          loadData: .live,
+          mainQueue: mainQueue,
+          bgQueue: bgQueue
+        )
       },
       home: {
         HomeEnvironment(