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

* Add AppLockCoordinator and WindowManager.

UITests/Sources/AppLockScreenUITests.swift

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+//
+// 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 ElementX
+import XCTest
+
+@MainActor
+class AppLockScreenUITests: XCTestCase {
+    func testScreen() async throws {
+        let app = Application.launch(.appLockScreen)
+        try await app.assertScreenshot(.appLockScreen)
+    }
+}

UITests/Sources/__Snapshots__/Application/en-GB-iPad-9th-generation.appLockScreen.png

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+oid sha256:e09c1a718424e75c120fc2f2038f786388fcb2542231bc737c332e0b23004b33
+size 67281

UITests/Sources/__Snapshots__/Application/en-GB-iPhone-14.appLockScreen.png

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+version https://git-lfs.github.com/spec/v1
+oid sha256:abb591b36f490253c34fd00092e45ba35961ba0aab4d6fcb8efb036ac3c2575e
+size 67921

UITests/Sources/__Snapshots__/Application/pseudo-iPad-9th-generation.appLockScreen.png

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+version https://git-lfs.github.com/spec/v1
+oid sha256:89df727aac25c1d26ec86fe564ae97ca1687ba9d710dd5fc234f0052676c0a19
+size 69836

UITests/Sources/__Snapshots__/Application/pseudo-iPhone-14.appLockScreen.png

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+version https://git-lfs.github.com/spec/v1
+oid sha256:d08f08f1d3e22048432ec4733cd0192e763325760d338864e9395cb24e124f21
+size 72314