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/RegisterFeature/RegisterFeature.swift

@@ -83,7 +83,7 @@ public let registerReducer = Reducer<RegisterState, RegisterAction, RegisterEnvi
         let db = try env.db()
         try env.messenger.register(username: username)
         var contact = try env.messenger.e2e.tryGet().getContact()
-        var facts: [Fact] = (try? contact.getFacts()) ?? []
+        var facts: [Fact] = try contact.getFacts()
         facts.removeAll(where: { $0.type == 0 })
         facts.append(Fact(fact: username, type: 0))
         try contact.setFacts(facts)