Add support for sliver-beacons

[whotwagner]

Currently only sliver-sessions are supported. Add support for sliver-beacons!

[thorinaboenke]

is this implemented with for example:

     async def get_session_or_beacon(self,
                                    name,
                                    beacon=False) -> InteractiveBeacon | InteractiveSession:
        if beacon:
            return await self.get_beacon_by_name(name)
        else:
            return await self.get_session_by_name(name)

commit 6526689

[whotwagner]

Yes, but it is still buggy and need to be fixed. That's why I left that open