Fixes #317 - Adopt a split layout for iPad and Mac apps

Rename navigation components: SplitScreenCoordinator -> NavigationSplitCoordinator, StackScreenCoordinator -> NavigationStackCoordinator and SingleScreenCoordinator -> NavigationRootCoordinator
[0c161039] Tweak navigation logging
[826c19cf] Move the navigation dismissal callbacks to the NavigationModule, add SingleScreenCoordinator tests
[b8830d9c] Add tests
[252ad119] Merge the StackScreenCoordinator and SplitScreenCoordinators into a single file and stop publicly exposing their internal workings. Add more documentation.
[37671699] Cleanup navigation logging
[51406184] Use the parent SplitScreenCoordinator to present embedded StackScreenCoordinator sheets
[b94b04c9] Retract the room "syncing" indicator when dismissing a room
[1467b0ac] Correctly move to the no room selected state when popping in compact layouts
[10bf2ad8] Allow nilling root coordinators, replace present/dismiss sheet with setSheetCoordinator(?)
[33716784] Add single screen coordinator fade transition animation
[3cbe65e7] Prevent the timeline table view from being reused between different rooms
[9c94c50b] Move files around
[c10b6bc5] Adapt the user session state machine to the split layout
[7115a319] Fix unit and UI tests
[1ece59e8] Fix login flows
[6884dc3b] Use modules everywhere the underlying object is a NavigationModule
[ab08d44c] Rename navigation components to: SingleScreenCoordinator, SplitScreenCoordinator and StackScreenCoordinator
[ada2be57] Add SplitNavigationController

* Remove the navigationRootCoordinator from the UserSessionFlowCoordinator

ElementX/Sources/Application/Navigation/NavigationModule.swift

@@ -0,0 +1,38 @@
+//
+// 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
+
+/// A CoordinatorProtocol wrapper and type erasing component that allows
+/// dynamically presenting arbitrary screens
+struct NavigationModule: Identifiable, Hashable {
+    let id = UUID()
+    let coordinator: any CoordinatorProtocol
+    let dismissalCallback: (() -> Void)?
+    
+    init(_ coordinator: any CoordinatorProtocol, dismissalCallback: (() -> Void)? = nil) {
+        self.coordinator = coordinator
+        self.dismissalCallback = dismissalCallback
+    }
+    
+    static func == (lhs: NavigationModule, rhs: NavigationModule) -> Bool {
+        lhs.id == rhs.id
+    }
+    
+    func hash(into hasher: inout Hasher) {
+        hasher.combine(id)
+    }
+}