factor out logger into configuration file and give option to specify verbosity

[kjappelbaum]

Logger level is currently hardcoded to info and used at only one place in the code. If we log more, the users might want to be able to specify the level.

We could log a bit more and put all the logging configuration into its own module.

Also we could replace the warnings from the warnings module with logs of level warning

[kjappelbaum]

@byooooo probably we should discuss what we should log by default and what is useful information we want to have for further developments

[github-actions]

Stale issue message

[kjappelbaum]

https://github.com/Delgan/loguru