Fixes #734 - Add a "View logs" option to the report a problem screen

Move bug report and log viewer responsibility to a separate flow coordinator. Reuse it as a child coordinator in the authentication, userSessionFlow and settings flow coordinators.

ElementX/Sources/Screens/LogViewerScreen/LogViewerScreenCoordinator.swift

@@ -0,0 +1,60 @@
+//
+// 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.
+//
+
+// periphery:ignore:all - this is just a logViewer remove this comment once generating the final file
+
+import Combine
+import SwiftUI
+
+struct LogViewerScreenCoordinatorParameters { }
+
+enum LogViewerScreenCoordinatorAction {
+    case done
+}
+
+final class LogViewerScreenCoordinator: CoordinatorProtocol {
+    private let parameters: LogViewerScreenCoordinatorParameters
+    private var viewModel: LogViewerScreenViewModelProtocol
+    private var cancellables = Set<AnyCancellable>()
+    
+    private let actionsSubject: PassthroughSubject<LogViewerScreenCoordinatorAction, Never> = .init()
+    var actions: AnyPublisher<LogViewerScreenCoordinatorAction, Never> {
+        actionsSubject.eraseToAnyPublisher()
+    }
+    
+    init(parameters: LogViewerScreenCoordinatorParameters) {
+        self.parameters = parameters
+        
+        viewModel = LogViewerScreenViewModel()
+    }
+    
+    func start() {
+        viewModel.actions.sink { [weak self] action in
+            MXLog.info("Coordinator: received view model action: \(action)")
+            
+            guard let self else { return }
+            switch action {
+            case .done:
+                self.actionsSubject.send(.done)
+            }
+        }
+        .store(in: &cancellables)
+    }
+        
+    func toPresentable() -> AnyView {
+        AnyView(LogViewerScreen(context: viewModel.context))
+    }
+}