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/Screens/RoomDetailsScreen/RoomDetailsScreenModels.swift

@@ -22,6 +22,7 @@ enum RoomDetailsScreenViewModelAction {
     case requestRolesAndPermissionsPresentation
     case startCall
     case displayPinnedEventsTimeline
+    case displayMediaEventsTimeline
     case displayKnockingRequests
 }
 
@@ -48,13 +49,15 @@ struct RoomDetailsScreenViewState: BindableState {
     var notificationSettingsState: RoomDetailsNotificationSettingsState = .loading
     var canJoinCall = false
     var pinnedEventsActionState = RoomDetailsScreenPinnedEventsActionState.loading
+    
     var knockingEnabled = false
     var isKnockableRoom = false
-    
     var canSeeKnockingRequests: Bool {
         knockingEnabled && dmRecipient == nil && isKnockableRoom && (canInviteUsers || canKickUsers || canBanUsers)
     }
     
+    var mediaBrowserEnabled = false
+    
     var canEdit: Bool {
         !isDirect && (canEditRoomName || canEditRoomTopic || canEditRoomAvatar)
     }
@@ -197,6 +200,7 @@ enum RoomDetailsScreenViewAction {
     case processTapRolesAndPermissions
     case processTapCall
     case processTapPinnedEvents
+    case processTapMediaEvents
     case processTapRequestsToJoin
 }