Knock requests banner (#3510)

* need to add strings

* preview tests

* code improvements

* fixed an error

ElementX/Sources/Other/Avatars.swift

@@ -72,7 +72,8 @@ enum UserAvatarSizeOnScreen {
     case editUserDetails
     case suggestions
     case blockedUsers
-    case knockingUsers
+    case knockingUsersStack
+    case knockingUser
 
     var value: CGFloat {
         switch self {
@@ -102,8 +103,10 @@ enum UserAvatarSizeOnScreen {
             return 96
         case .dmDetails:
             return 75
-        case .knockingUsers:
+        case .knockingUsersStack:
             return 28
+        case .knockingUser:
+            return 32
         }
     }
 }