refactor(sio-client): export DisconnectDescription type (#5392)

Related: #4556

Author: Valentin-Rault

packages/socket.io-client/lib/index.ts

@@ -1,6 +1,6 @@
 import { url } from "./url.js";
 import { Manager, ManagerOptions } from "./manager.js";
-import { Socket, SocketOptions } from "./socket.js";
+import { DisconnectDescription, Socket, SocketOptions } from "./socket.js";
 import debugModule from "debug"; // debug()
 
 const debug = debugModule("socket.io-client"); // debug()
@@ -91,6 +91,7 @@ export { protocol } from "socket.io-parser";
  */
 
 export {
+  DisconnectDescription,
   Manager,
   ManagerOptions,
   Socket,