Add Authentication Flow WIP.

- Add Registration Screen.
- Add Server Selection Screen.
- Rename AuthenticationCoordinator to LegacyAuthenticationCoordinator.
- Add AuthenticationService and RegistrationWizard.
- Async extensions.
- Add global white and EMS colors to the themes.
- Add tests for server selection and registration screens.
- Accessibility and iPad layout tweaks.
- Remove MainActor from Auth Coordinators/VMs/Views.
(It broke the protocol conformances so now the methods and properties are marked individually.)

RiotSwiftUI/Modules/Authentication/Common/Service/MatrixSDK/AuthenticationPendingData.swift

@@ -0,0 +1,43 @@
+// 
+// Copyright 2022 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Foundation
+
+/// This class holds all pending data when creating a session, either by login or by register
+class AuthenticationPendingData {
+    let homeserverAddress: String
+    
+    // MARK: - Common
+    
+    var clientSecret = UUID().uuidString
+    var sendAttempt: UInt = 0
+    
+    // MARK: - For login
+    
+    // var resetPasswordData: ResetPasswordData?
+    
+    // MARK: - For registration
+    
+    var currentSession: String?
+    var isRegistrationStarted = false
+    var currentThreePIDData: ThreePIDData?
+    
+    // MARK: - Setup
+    
+    init(homeserverAddress: String) {
+        self.homeserverAddress = homeserverAddress
+    }
+}