Read Receipts display with the user avatar (#1038)

* added the read receipt into the code

* fixed some things lost during merge

* implemented the status view to be always at the trailing side

* preview code for better testing

* removed timelineStyle modifier

* removed also the group style

* added some UI tests for the read receipts

ElementX/Sources/Other/AvatarSize.swift

@@ -49,9 +49,12 @@ enum UserAvatarSizeOnScreen {
     case startChat
     case memberDetails
     case inviteUsers
+    case readReceipt
 
     var value: CGFloat {
         switch self {
+        case .readReceipt:
+            return 16
         case .timeline:
             return 32
         case .home: