Anpl 862 configure pre commit for dev

[ahbensiali]

pre-commit added to stack

📝 Summary

As part of our code cleanup and linting efforts, pre-commit has been added using this ticket.
pre-commit is the main container that holds other tools used to clean and check our code and commits.

This PR ...

• added pre-commit
• added pre-commit configs
• added flake8 & configs
• added isort
• added black
• added commit-msg configuration for message validation

Merging this PR will have the following side-effects:

• no affect in deployment only in local

🔍 What should the reviewer concentrate on?

• testing commit message format
• test black and isort work by changing something in a python file
• check flake works by seeing if a changed file throws up errors

🧑‍💻 How should the reviewer test these changes?

• pull changes
• pip install -r requirements.dev.txt
• pre-commit install --hook-type commit-msg
• pre-commit install
• add & commit files as normal
• omit jira ticket number to check jira check is working
• change a python file to have it formatted

📚 Documentation status

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

[LouiseABowler]

I've left one question that I think we should resolve before merging but pre-commit is working as expected for me now 👍

[LouiseABowler]

I've given each of the checks a try and they're all working as expected, nice work @ahbensiali! 🙌

I'll approve now so you can merge when you want to, but we shouldn't each start using the hooks ourselves until we do the big formatting commit at some point in the next couple of weeks.