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/JoinRoomScreen/JoinRoomScreenViewModel.swift

@@ -221,7 +221,7 @@ class JoinRoomScreenViewModel: JoinRoomScreenViewModelType, JoinRoomScreenViewMo
                                          title: L10n.screenInvitesDeclineChatTitle,
                                          message: L10n.screenInvitesDeclineChatMessage(roomName),
                                          primaryButton: .init(title: L10n.actionCancel, role: .cancel, action: nil),
-                                         secondaryButton: .init(title: L10n.actionDecline, role: .destructive, action: { Task { await self.declineInvite() } }))
+                                         secondaryButton: .init(title: L10n.actionDecline, role: .destructive) { Task { await self.declineInvite() } })
     }
     
     private func showCancelKnockConfirmationAlert() {
@@ -229,7 +229,7 @@ class JoinRoomScreenViewModel: JoinRoomScreenViewModelType, JoinRoomScreenViewMo
                                          title: L10n.screenJoinRoomCancelKnockAlertTitle,
                                          message: L10n.screenJoinRoomCancelKnockAlertDescription,
                                          primaryButton: .init(title: L10n.actionNo, role: .cancel, action: nil),
-                                         secondaryButton: .init(title: L10n.screenJoinRoomCancelKnockAlertConfirmation, role: .destructive, action: { Task { await self.cancelKnock() } }))
+                                         secondaryButton: .init(title: L10n.screenJoinRoomCancelKnockAlertConfirmation, role: .destructive) { Task { await self.cancelKnock() } })
     }
     
     private func declineInvite() async {

ElementX/Sources/Screens/JoinRoomScreen/View/JoinRoomScreen.swift

@@ -261,7 +261,7 @@ struct JoinRoomScreen_Previews: PreviewProvider, TestablePreview {
                                                                                 topic: "“Science and technology were the only keys to opening the door to the future, and people approached science with the faith and sincerity of elementary school students.”",
                                                                                 avatarURL: .mockMXCAvatar,
                                                                                 memberCount: UInt(100),
-                                                                                isHistoryWorldReadable: false,
+                                                                                isHistoryWorldReadable: nil,
                                                                                 isJoined: membership.isJoined,
                                                                                 isInvited: membership.isInvited,
                                                                                 isPublic: membership.isPublic,