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/RoomScreenModels.swift

@@ -18,6 +18,7 @@ import Combine
 import UIKit
 
 enum RoomScreenViewModelAction {
+    case displayRoomDetails
     case displayVideo(videoURL: URL)
     case displayFile(fileURL: URL, title: String?)
     case displayEmojiPicker(itemId: String)
@@ -30,6 +31,7 @@ enum RoomScreenComposerMode: Equatable {
 }
 
 enum RoomScreenViewAction {
+    case headerTapped
     case displayEmojiPicker(itemId: String)
     case emojiTapped(emoji: String, itemId: String)
     case paginateBackwards