Missing .clientdata accessors

[jcheng5]

There's useful information being passed from the client to the server that we should make accessible from the session object. I've had to use these myself to get at output width/height, e.g. for Plotly demos, and the URL bits are obviously useful for dynamic UI. See https://shiny.posit.co/r/articles/build/client-data/

[jcheng5]

IfWhen we add this, we should also add a cool example that shows querystring usage. Maybe resurrect and port https://github.com/jcheng5/scorecard-app

[wch]

I think this is a duplicate of #623.

[psychemedia]

Is thia still an open issue? Are there any particular reasons that this hard to do in Python shinylive?

I deally Inwould like to be able to generate and share a url to a shiny app with ui parameter settings passed cia the Url. This would make it possible to share a current view or setup for a dashboard.