More Moderation tweaks (#2566)

* Show room member role changes in the timeline.

* Fix a bug in room flow coordinator.

* Tidy up roles and permissions flow.

* Refresh the power levels in the room details screen.

* Automatically update permissions after saving.

* Remove extra button.

* Add a short delay to the roles and permissions screen snapshots.
The permissions rows are now in a loading state initially.

ElementX/Sources/Screens/RoomDetailsScreen/RoomDetailsScreenViewModel.swift

@@ -135,6 +135,7 @@ class RoomDetailsScreenViewModel: RoomDetailsScreenViewModelType, RoomDetailsScr
             .throttle(for: .milliseconds(200), scheduler: DispatchQueue.main, latest: true)
             .sink { [weak self] _ in
                 self?.updateRoomInfo()
+                Task { await self?.updatePowerLevelPermissions() }
             }
             .store(in: &cancellables)
     }