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

Closes #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

[Didayolo]

Please fix formatting issues, so the pytests actually start:

^@^@src/apps/competitions/tasks.py:119:1: E302 expected 2 blank lines, found 1
src/apps/competitions/tasks.py:218:21: W503 line break before binary operator
src/apps/competitions/tasks.py:337:21: W503 line break before binary operator
src/apps/competitions/tasks.py:469:1: E302 expected 2 blank lines, found 1
src/apps/competitions/tasks.py:492:1: E303 too many blank lines (3)
src/apps/competitions/tasks.py:609:5: E303 too many blank lines (3)
src/apps/competitions/tasks.py:654:1: E302 expected 2 blank lines, found 1
src/apps/competitions/admin.py:373:1: E302 expected 2 blank lines, found 0
src/apps/competitions/views.py:24:1: E303 too many blank lines (3)
src/apps/competitions/views.py:41:5: E303 too many blank lines (2)
src/apps/competitions/views.py:139:49: W291 trailing whitespace
src/apps/competitions/views.py:242:9: W503 line break before binary operator
src/apps/competitions/views.py:243:9: W503 line break before binary operator
src/apps/competitions/views.py:248:5: E303 too many blank lines (2)
src/apps/competitions/views.py:325:9: W503 line break before binary operator
src/apps/competitions/views.py:326:9: W503 line break before binary operator
src/apps/competitions/views.py:331:5: E303 too many blank lines (2)
src/apps/competitions/views.py:343:9: W503 line break before binary operator
src/apps/competitions/views.py:344:9: W503 line break before binary operator
src/apps/competitions/views.py:364:9: W503 line break before binary operator
src/apps/competitions/views.py:365:9: W503 line break before binary operator
src/apps/competitions/views.py:372:6: W292 no newline at end of file
src/apps/competitions/models.py:67:5: E303 too many blank lines (2)
src/apps/competitions/unpackers/base_unpacker.py:32:33: W291 trailing whitespace
src/apps/competitions/unpackers/base_unpacker.py:204:1: W293 blank line contains whitespace
src/apps/competitions/unpackers/base_unpacker.py:245:5: E303 too many blank lines (3)
src/apps/competitions/unpackers/base_unpacker.py:306:29: W503 line break before binary operator
src/apps/competitions/unpackers/base_unpacker.py:331:5: E303 too many blank lines (4)
src/apps/profiles/models.py:353:9: E128 continuation line under-indented for visual indent
src/apps/profiles/models.py:354:9: E128 continuation line under-indented for visual indent
src/apps/profiles/models.py:355:9: E128 continuation line under-indented for visual indent
src/apps/profiles/models.py:356:9: E128 continuation line under-indented for visual indent
src/apps/profiles/models.py:357:9: E128 continuation line under-indented for visual indent
src/apps/profiles/models.py:358:9: E128 continuation line under-indented for visual indent
src/apps/profiles/models.py:359:5: E124 closing bracket does not match visual indentation
src/apps/profiles/models.py:367:1: W391 blank line at end of file
src/apps/profiles/models.py:367:1: W293 blank line contains whitespace
src/apps/api/views/competitions.py:43:1: E402 module level import not at top of file
src/apps/api/views/competitions.py:48:1: E303 too many blank lines (3)
src/apps/api/views/competitions.py:465:1: W293 blank line contains whitespace
src/apps/api/views/competitions.py:467:5: E303 too many blank lines (2)
src/apps/api/views/competitions.py:788:1: W293 blank line contains whitespace
src/apps/api/views/competitions.py:1235:1: W293 blank line contains whitespace
src/apps/api/views/competitions.py:1236:1: W293 blank line contains whitespace
src/apps/api/views/competitions.py:1330:24: F821 undefined name 'users_by_id'
src/apps/api/views/competitions.py:1332:20: F821 undefined name 'users_by_id'
src/apps/api/views/competitions.py:1335:21: F821 undefined name 'users_by_username'
src/apps/api/views/competitions.py:1344:35: F821 undefined name 'users_by_id'
src/apps/api/views/competitions.py:1345:36: F821 undefined name 'users_by_id'
src/apps/api/views/competitions.py:1350:16: W292 no newline at end of file