Room details screen (#348)

* Create screen module

* Display details on header tap

* Add strings

* Add room avatar size on details

* Update members method signature

* Use room proxy values

* Create room members screen

* Display room members on tap

* Update previews and mock room proxy

* Commit project file

* Various tweaks and cleanup following code review

* More small tweaks + UI and screenshot tests

Co-authored-by: Stefan Ceriu <stefanc@matrix.org>

ElementX/Sources/Screens/RoomScreen/RoomScreenViewModel.swift

@@ -98,6 +98,8 @@ class RoomScreenViewModel: RoomScreenViewModelType, RoomScreenViewModelProtocol
     // swiftlint:disable:next cyclomatic_complexity
     override func process(viewAction: RoomScreenViewAction) async {
         switch viewAction {
+        case .headerTapped:
+            callback?(.displayRoomDetails)
         case .paginateBackwards:
             await paginateBackwards()
         case .itemAppeared(let id):