feat: add support for typed events (#3822)

Syntax:

```ts
interface ClientToServerEvents {
  "my-event": (a: number, b: string, c: number[]) => void;
}

interface ServerToClientEvents {
  hello: (message: string) => void;
}

const io = new Server<ClientToServerEvents, ServerToClientEvents>(httpServer);

io.emit("hello", "world");

io.on("connection", (socket) => {
  socket.on("my-event", (a, b, c) => {
    // ...
  });

  socket.emit("hello", "again");
});
```

The events are not typed by default (inferred as any), so this change
is backward compatible.

Note: we could also have reused the method here ([1]) to add types to
the EventEmitter, instead of creating a StrictEventEmitter class.

Related: https://github.com/socketio/socket.io/issues/3742

[1]: https://github.com/binier/tiny-typed-emitter