Participants groups (adding groups with queue)

[IdirLISN]

A brief description of the purpose of the changes contained in this PR.

Adding button inside the edit section of competitions to create groups of user linked to a queue.

In edit section of competition, we can now create groups for this specific competition, edit groups, add participant to groups and associate a queue to groups.

A new table in participant panel is added.

Multiple queues can be used in a single competition and submission participant will be able to have a access to a dedicated vhost and compute worker.

Issues this PR resolves

#2100

A checklist for hand testing

• check group model object creation, uptade, delete.
• check if users are redirected to queues when submitting.
• check if groups are not visible in other competitions (private).
• check UX/UI in edit page.
• check UX/UI in participants table.
• check the group display in my submission page.
• test migrations at deployment

Checklist

• Code review by me
• Hand tested by me
• I'm proud of my work
• Code review by reviewer
• Hand tested by reviewer
• CircleCi tests are passing
• Ready to merge