Setup mypy

[tomtitherington]

Summary

Add mypy to the backend project.

Background

• Reason for Enhancement: Better type safety and readability.

Proposed Course of Action

• Changes:
• [ ] Create a Mypy config file in the root of the backend project
• [ ] Add Django stubs
• [ ] Add Mypy checks to the pre-commit hooks
• [ ] Add Mypy checks to GitHub action runs

Additional Information

• Notes: Basic setup instructions courtesy of ChatGPT

Dependent Issue(s)

• [x] #37

[tomtitherington]

Don't add this to the Vscode recommended extensions yet since it appears to be a bit slow when using the daemon and too slow to use without the daemon.. Vscode environments should use Pylance / Pyright for the time being.

Add this to the GitHub action to be run on PR merge checks and recommend that developers run this as a pre-commit check.