audio, video conversation (call, chat), screen/CLI sharing (feature request)

Would propose the ability to have an audio, audio+video conversation. Possibly through 3rd party apps like Slack has - https://slack.com/apps/category/At7KGP7Z3N-voice-video
Check also [Jitsi Meet](https://meet.jit.si/), proposed an idea also there - https://github.com/jitsi/jitsi-meet/issues/4337
Not only 1:1 but also group (team) audio/video calls.
One example could be also Discord where are separate voice/video channels possible - you can do similarly in Keybase.
Also screen sharing would be appreciated (whole screen, one selected window, possibly also selected area on screen). This could be done via Jitsi Meet if it could be integrated with Keybase like Slack has.
As Keybase is also a CLI application then sharing a terminal would be also appreciated - in view or also collaborative mode. E.g. [Shellshare](https://github.com/vitorbaptista/shellshare) is in view mode and [Teleconsole](https://github.com/gravitational/teleconsole) is in collaborative mode to share a CLI. These CLI sharings should certainly work across different operating systems where Keybase available is).

The issue names no repository files, tests, or entry points. Start by reviewing the Keybase client architecture and the referenced Jitsi Meet, Shellshare, and Teleconsole projects, then narrow the request to a defined capability. Done would require an agreed scope, platform requirements, and acceptance criteria for the selected conversation, screen-sharing, or CLI-sharing feature.

Written by the indexing model from the issue text.