Swarm: add support for multiple roles

Goal

In a swarm, pretty every action should be an action that needs to be permitted for a role and administrators should be able to add new roles.

TODO

analyze what needs to change in the daemon

changed due date to December 31, 2023

added BacklogLow swarm labels

added to epic &49 (closed)

changed epic to &53 (closed)

changed title from Swarm: mode where everybody is admin by default to Swarm: add support for multiple roles

changed the description

marked this issue as related to #798

Can you also have different permissions for users who use the SIP-Call to join a conference by phone (using a phone number)?

jami-project#1398 (comment 34318)

changed epic to &67

added sprintbacklog label

https://review.jami.net/c/jami-daemon/+/30126