Add Team Assessments

[CheongYeeMing]

Source Academy - Team Assessments Module

This is the PR for the MVP of integrating Team Assessments into the existing Source Academy. Collaboration among students in coursework through the implementation of this collaborative module offers immense benefits and serves as a powerful motivation for its adoption. By providing students with the option to collaborate, share ideas, and work together on assessments, projects, and discussions, they can tap into a diverse range of perspectives and insights.

To be completed:

• Migrations to modify and build onto existing schema
• Model and Controller implementation for Teams
• Configure router
• Retrieve Team Assessments
• Retrieve Team Submissions
• Integrate into Notifications (Elixir)
• Refactor SQL chunk in Assessments.exs
• Retrieve Team Submissions for Grading
• Retrieve Team Submission for Students
• Allow saving of Team Submission
• Implement the Safe-Save feature
• Integrate into Grading System
• Swagger Documentation
• Add Teams to seeds.exs
• Tests

Notes:

• This PR is in conjunction with the FE PR for Team Assessments.

[RichDom2185]

Just one comment for now (reviewed ~ half the files):

[RichDom2185]

I just realised this results in an n+1 query problem. We should use a join instead to keep it to O(1) total queries.

[RichDom2185]

Actually, on second thought, should be fine as there are no team members for now, but we might want to look at it again in the future. Will file an issue.

[RichDom2185]

LGTM, thanks a lot!