Add AnalyticsPrompt to SwiftUI target and replace old UIAlertController.

RiotSwiftUI/Modules/AnalyticsPrompt/AnalyticsPromptViewModel.swift

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+// File created from SimpleUserProfileExample
+// $ createScreen.sh AnalyticsPrompt AnalyticsPrompt
+//
+// Copyright 2021 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
+import Combine
+
+@available(iOS 14, *)
+typealias AnalyticsPromptViewModelType = StateStoreViewModel<AnalyticsPromptViewState,
+                                                             AnalyticsPromptStateAction,
+                                                             AnalyticsPromptViewAction>
+@available(iOS 14, *)
+class AnalyticsPromptViewModel: AnalyticsPromptViewModelType {
+
+    // MARK: - Properties
+
+    // MARK: Private
+
+    // MARK: Public
+
+    var completion: ((AnalyticsPromptViewModelResult) -> Void)?
+
+    // MARK: - Setup
+    
+    /// Initialize a view model with the specified prompt type and app display name.
+    init(promptType: AnalyticsPromptType, appDisplayName: String) {
+        super.init(initialViewState: AnalyticsPromptViewState(promptType: promptType, appDisplayName: appDisplayName))
+    }
+
+    // MARK: - Public
+    
+    override func process(viewAction: AnalyticsPromptViewAction) {
+        switch viewAction {
+        case .enable:
+            enable()
+        case .disable:
+            disable()
+        case .openTermsURL:
+            openTermsURL()
+        }
+    }
+
+    override class func reducer(state: inout AnalyticsPromptViewState, action: AnalyticsPromptStateAction) {
+        // There is no mutable state to reduce :)
+    }
+    
+    /// Enable analytics. The call to the Analytics class is made in the completion.
+    private func enable() {
+        completion?(.enable)
+    }
+
+    /// Disable analytics. The call to the Analytics class is made in the completion.
+    private func disable() {
+        completion?(.disable)
+    }
+    
+    /// Open the service terms link.
+    private func openTermsURL() {
+        guard let url = URL(string: "https://element.io/cookie-policy") else { return }
+        UIApplication.shared.open(url)
+    }
+}