fix: properly export the Socket class

Before this change, `require("socket.io-client").Socket` would return
"undefined".

Note: having access to the Socket class allows users to modify its
prototype.

Related: socketio/socket.io#3726

lib/index.ts

@@ -100,5 +100,6 @@ exports.connect = lookup;
  */
 
 export { Manager, ManagerOptions } from "./manager";
-export { lookup as io, Socket, SocketOptions };
+export { Socket } from "./socket";
+export { lookup as io, SocketOptions };
 export default lookup;

wrapper.mjs

@@ -1,5 +1,6 @@
 import io from "./build/index.js";
 
 export const Manager = io.Manager;
+export const Socket = io.Socket;
 export { io };
 export default io;