Media gallery - part 1(#3588)

* Introduce a `MediaEventsTimelineFlowCoordinator`
* Update SDK API and architecture
* Add a feature flag, add translations
* Move the media events timeline presentation under the room flow coordinator state machine
* Rename `TimelineViewState.timelineViewState` of type `TimelineState` to `timelineState`
* Enabled SwiftLint's `trailing_closure` rule and fix the warnings.

ElementX/Sources/Application/Application.swift

@@ -42,11 +42,11 @@ struct Application: App {
                         openURLInSystemBrowser($0)
                     }
                 }
-                .onContinueUserActivity("INStartVideoCallIntent", perform: { userActivity in
+                .onContinueUserActivity("INStartVideoCallIntent") { userActivity in
                     // `INStartVideoCallIntent` is to be replaced with `INStartCallIntent`
                     // but calls from Recents still send it ¯\_(ツ)_/¯
                     appCoordinator.handleUserActivity(userActivity)
-                })
+                }
                 .task {
                     appCoordinator.start()
                 }