Use descriptive group name instead of room address as room name on matrix room

[pravi]

Is your feature request related to a problem? Please describe.
Currently when connecting to native xmpp rooms, the room name on matrix side is the room address not the room name on xmpp side (which is more descriptive)

Describe the solution you'd like
Name on the matrix side should be name on the xmpp side, not the room address.

Describe alternatives you've considered

Additional context