Consider adding transient to room list buffer

[sleep-walker]

I tried to set new matrix account with Ement as a new client. I was looking for operations like

• joining new room
• joining existing spaces
• create new space
• assign channel to space
• forgetting room
• setting notifications
• ....

There was helpful transient in room buffer but it required to open the buffer to perform operations which feels natural for room list buffer. I was able to do actions via M-x menu but it felt like I have broken set up and not as intended way.

Please, consider adding transient to room list buffer as well.

[alphapapa]

Thanks.