CI, linting, and tests

[chanind]

This PR adds black, pytest, and ruff to dev.in, and adds a simple github actions script to run make style and make test. In addition, I ran make fmt before committing, which reformatted a ton of code, thus the changes seen here.

Some other things to note:

• I changed the test style to use pytest instead of unittest, which matches what's in the Makefile. Also I feel pytest is a better test runner than unittest (open to discussion on this if there's different views)
• I didn't commit the updated dev.txt and main.txt, since they change depending on which system runs the make script which will cause conflicts depending on who ran the generation script last.
• I didn't optimize the github action performance, so it's very slow during dependency install right now. We can improve that by caching dependencies between builds. I'll do that in a separate PR after this is merged.
• I didn't set up isort, but it might be handled anyway by ruff. We can revisit that later if needed.
• I didn't set up Pyright type checking. That may require some code changes to get everything compliant, and this PR is already large enough IMO. We can enable Pyright in a follow-up PR.

[dtch1997]

LGTM