Programatically send a link to the viewer to have the viewer open a resource

[jleibs]

I'm finding a recurring pattern occurring in my notebooks where I fetch data from a known Rerun resource (i.e. by running a server-side query), only to then re-transmit that data to the viewer (esp in a notebook context).

Rather than python needing to be involved here, it would be nice if I could directly send the viewer / notebook widget a command to open that url

For example:

rr.open("rerun:///recording/12344")

This will be particularly important when we add support for larger-than-RAM incremental resource fetching from the viewer.