* Add the timeline controller factory to the timeline view model.
In preparation for building a timeline to swipe through media in QuickLook.
* Refactor RoomTimelineControllerFactory.
* Refactor RoomTimelineController.
* Refactor RoomTimelineProvider.
* Overlay a progress indicator for downloads instead of using a toast indicator.
* Update the SDK.
* Remove the feature flag for the media browser.
* Remove the media captions feature flag too.
* Add unit test cases for download failure and swiping between items.
* Snapshots (with the media browser visible in the screen).
* 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.