♻️ Refactor prepro

[dyollb]

What do these changes do?

• add gh action to install and test the package
• add unit tests
• refactor code in prepro, load/save_tissue_list now use same Dict[str,int] and check for duplicate labels

Related issue/s

• Use pip cache and possibly os/python matrix for gh action #4

How to test

• run the tests with pytest tests from inside the folder
• check the gh action log (and badge)

Checklist

• Unit tests for the changes exist

[dyollb]

@pcrespov pip (via setup.py) install currently checks for cuda 11, and installs one or the other requirements. For this reason I would not use dev.txt with -r generic.txt.

• we should be able to install optional stuff (like pytest) for flavors of the package
• make dev should use that mechanism to do the same, not something independent

[pcrespov]

👍