73 add pre-commit GitHub action

[John-Sharples]

In this PR:

• Add a pre-commit github action to run the all pre-commit checks. This means github actions and pre-commit will align.
• small update to .pre-commit-config.yaml to make black run
• some isort and black changes to files.

The pre-commit entry point should probably be pre-commit run -a to run for all files. However this currently raises a lot of mypy and pylint errors. Aware that some outstanding PRs will fix some of these issues, but if this is merged we should capture that as an issue.