Messenger example - send auth request

• Refactor user search
• Add contact feature
• Save found contacts
• Add send request feature
• Send auth request
• Fix saving my contact during registration

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

@@ -4,6 +4,7 @@ import Foundation
 import HomeFeature
 import RegisterFeature
 import RestoreFeature
+import SendRequestFeature
 import UserSearchFeature
 import WelcomeFeature
 import XXMessengerClient