Feature/run black

[michaeljcollinsuk]

📝 Summary

This PR contributes to ministryofjustice/analytical-platform#3374

Specifically it:

• Runs black on the whole codebase to bring a consistent style across all files.
• Add super-linter CI job. We are using this to primarily run black, flake8 and isort, however we may utilise some of the other linters in the future

🧑‍💻 How should the reviewer test these changes?

• Pull the changes, update your dev dependencies
• Run black . && flake8 . && isort . from your terminal to run all three checks. There should be no proposed changes
• All checks in CI are passing

📚 Documentation status

• No changes to the documentation are required
• This PR includes all relevant documentation
• Documentation will be added in the future because ... (see issue #...)

[jamesstottmoj]

LGTM