Add polling support

[swaty007]

Hi, I'd like to propose adding support for Pusher's additional connection transports—namely xhr_streaming, xhr_polling, and sockjs—to package laravel/reverb. Currently, it only supports ws and wss, but as described in Pusher's documentation, these additional transports could be beneficial, especially in controlled environments. Integrating these would enhance the flexibility and robustness of the package.

Thanks for your consideration!