Add VSCode settings

[DeD1rk]

Closes #3371.

This checks in:

• Recommended extensions for linting and formatting
• Settings for those extensions
• A launch config for manage.py runserver and test with debugger

How to test

Try working on concrexit on a laptop with only VSCode, and no python-specific configuration. The see that, if you follow the recommendations, you get format on save and the rigt linting out of the box.

[ColonelPhantom]

Would it also be possible for this to deal with Poetry in some way?

[DeD1rk]

I'm not sure. The poetry install location depends on user settings and the python version, so we can't hardcode the python interpreter path afaik.

[ColonelPhantom]

It's possible to find the venv path with poetry env info -p, but I don't know if VSCode allows executing anything to find it. Also I'm guessing one still needs to install poetry (obviously), and then also do poetry install et al?

Maybe a bit cursed but one potential workaround could maybe be a 'setup' shellscript or similar that ensures poetry is setup, creates/updates the venv, and sets the correct path in the VSCode config file? Although that's very deep into magic territory.

[DeD1rk]

Yep that all still needs to be done manually. We can automate that in codespaces though 😏