Make timestamp parameter t optional

[miguelgrinberg]

Discussed in #385

^{Originally posted by PaxxPatriot November 24, 2024}
According to the JavaScript socket.io documentation, there is an option to deactivate the addition of the cache-busting timestamp parameter: https://socket.io/docs/v4/client-options/#timestamprequests

This is also reflected in the JavaScript code here: https://github.com/socketio/socket.io/blob/main/packages/engine.io-client/lib/transports/websocket.ts#L142. It is also disabled by default.

The behaviour of the current python-engineio implementation was blocking me from using socket.io with the Skinport socket.io Server.
So my suggestion is to make it possible to disable the addition of this parameter to the initial request URL.