fix(socket client) missing id wrapper method

lib/WetSock/SocketClient.js

@@ -24,4 +24,12 @@ export default class SocketClient {
 
         this.#ws.send(message);
     }
+
+    /**
+     * Gets the unique client id.
+     * @returns {string} - the unique client id
+     */
+    id() {
+        return this.#id;
+    }
 }