Initial setup ready for PIN/Biometric app lock. (#1876)

* Add AppLockCoordinator and WindowManager.

ElementX/Sources/Application/Windowing/SceneDelegate.swift

@@ -0,0 +1,29 @@
+//
+// Copyright 2023 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 SwiftUI
+
+/// A basic window scene delegate used to configure the `WindowManager`.
+///
+/// We don't support multiple scenes right now, so the implementation is pretty basic.
+class SceneDelegate: NSObject, UIWindowSceneDelegate {
+    weak static var windowManager: WindowManager!
+    
+    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
+        guard let windowScene = scene as? UIWindowScene, !ProcessInfo.isRunningTests else { return }
+        Self.windowManager.configure(with: windowScene)
+    }
+}