Make the room power levels optional as they can be missing depending on what state events are requested

ElementX/Sources/Services/Room/RoomPowerLevelsProxy.swift

@@ -10,7 +10,11 @@ import MatrixRustSDK
 struct RoomPowerLevelsProxy: RoomPowerLevelsProxyProtocol {
     private let powerLevels: RoomPowerLevels
     
-    init(_ powerLevels: RoomPowerLevels) {
+    init?(_ powerLevels: RoomPowerLevels?) {
+        guard let powerLevels else {
+            return nil
+        }
+        
         self.powerLevels = powerLevels
     }
     
@@ -18,6 +22,10 @@ struct RoomPowerLevelsProxy: RoomPowerLevelsProxyProtocol {
         powerLevels.values()
     }
     
+    var userPowerLevels: [String: Int64] {
+        powerLevels.userPowerLevels()
+    }
+    
     func canOwnUser(sendMessage messageType: MessageLikeEventType) -> Bool {
         powerLevels.canOwnUserSendMessage(message: messageType)
     }