Implement a nicer frontend for interfactive workflows

[BenjaminSchubert]

Currently, the cli output is not ideal when using multiple processes (-j X).

It would be nice to have a more interactive frontend that shows which steps are running, and allows selecting one to read its logs.

It could show something like

Step package finished successfully in <time_it_took>
Step mypy running <time_since_it_started> <spinner>
Step pylint running <time_since_it_started> <spinner>
Step pytest running <time_since_it_started> <spinner>
Step coverage waiting for pytest

And allows selection of one to show it's logs in the remaining part of the screen (or above?)

Please share feedback on what you think would look the best