feat: allow to pass an array to io.to(...)

In some cases it is necessary to pass an array of rooms instead of a single room.

New syntax:

```
io.to(["room1", "room2"]).except(["room3"]).emit(...);

socket.to(["room1", "room2"]).except(["room3"]).emit(...);
```

Related: https://github.com/socketio/socket.io/issues/3048