Added room timeline screen with live events listening and back pagination. Rearranged project files.

ElementX/Sources/Services/Authentication/KeychainControllerProtocol.swift

@@ -0,0 +1,15 @@
+//
+//  KeychainControllerProtocol.swift
+//  ElementX
+//
+//  Created by Stefan Ceriu on 14.02.2022.
+//
+
+import Foundation
+
+protocol KeychainControllerProtocol {
+    func setRestoreToken(_ token: String, forUsername username: String)
+    func restoreTokenForUsername(_ username: String) -> String?
+    func restoreTokens() -> [(username: String, token: String)]
+    func removeAllTokens()
+}