Switch to Ruff for code formatting and import sorting

[a-musing-moose]

🎯Aim

When developing I'd like to use Ruff for code formatting and import sorting as it is very fast, and reduces the number of development tools needed.

📕Context

We currently use black for code formatting, and isort for import sorting. The job of both these tools can now be performed by ruff. Whilst in the early days of black it occasionally clashed with isort that is no longer the case. So this is more about reducing the number of development tools needed - and the possibility of expanding the use of Ruff later on to also manage linting.

📝Relevant resources/doc's/people

• Ruff
• @a-musing-moose has performed this transition on a client project

✅Acceptance Criteria

• Black and Isort are removed from the list of dependencies
• Ruff is added to the list of dependencies
• The format invoke task is switched to using ruff for both code formatting and import sorting.