Refactor and fix error hydration message socket io

- Position message send will be on format :
message :
                    userId : user identification
                    roomId: room identification
                    position: position of user in map
                        x: user x position on map
                        y: user y position on map
 - Create Point object and interface to have position x and y of user in map.

back/src/Model/Websocket/ExSocketInterface.ts

@@ -1,5 +1,7 @@
 import {Socket} from "socket.io";
+import {PointInterface} from "./PointInterface";
 
 export interface ExSocketInterface extends Socket {
     token: object;
+    position: PointInterface;
 }