Devcontainer and coverage reporting

[dalmouiee]

Hey @pchlap,

Just a few things I thought would be helpful for pydicer development moving forward, would love to hear your thoughts :)

• Added a devcontainer with poetry and the dependencies all preinstalled as a post-step. Also comes with the jupyter extension installed
• I've added test coverage reporting to indicate how much our tests are covering the code base. Interestingly, it's currently at 68% when run locally and with no exclusions
• I am thinking of introducing mpy since we have stqarted to use types in Pydicer, but keen for your thoughts. We could add mypy checking to the pull requests github action along with a test coverage requirement of some percent (eg. 70-80%) before accepting new code. I'll have a go writing some more tests for pydicer and try getting it closer to 100% (no promises :P)

Thanks!

[pchlap]

This is absolutely brilliant, thanks @dalmouiee! I will take a closer look at this a bit later, but I love that you've added these items. I also think running mypy as part of our GitHub pipelines is a great idea.

[pchlap]

Awesome stuff @dalmouiee. Really appreciate your efforts here. Left a couple of comments/questions but I think we can merge this whenever you're ready.