Add talk:room:* CLI commands

* Create new rooms with talk:room:create
* Delete rooms with talk:room:delete
* Add users to rooms with talk:room:add
* Remove users from rooms with talk:room:remove
* Promote users to moderators with talk:room:promote
* Demote users with talk:room:demote
* Update room settings with talk:room:update
* List rooms of a user with talk:room:list

The talk:room:* CLI commands don't support one-to-one rooms on purpose.

Signed-off-by: Daniel Rudolf <github.com@daniel-rudolf.de>