Refactor logging configuration

[stefsmeets]

Description

This code moves the logging out of the _config.py module into its own _logging.py, so that the logger can be imported without initializing DIAGNOSTICS_PATH / CFG / etc. I also did some refactoring and added some documentation based on my understanding of this module. No functionality has been added or changed.

I hope that this will make it easer to work with. This is also needed for #907 for I'm looking to see if I can merge logging from there with the logging config that already exists.

• Addresses part of Restructure _config.py #889

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Checklist

• PR has a descriptive title for the changelog
• Code follows the style guide
  - [ ] Documentation is available for new functionality
  - [ ] YAML files pass pre-commit or yamllint checks
• Circle/CI tests pass
• Codacy code quality checks pass
• Documentation builds successfully on readthedocs
  - [ ] Unit tests are available

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[valeriupredoi]

nice one @stefsmeets - I think this is a cleaner more portable approach! One remark - would you be able to write a couple tests for the new module, it's good to have it test-covered as a module even if (I think) there were minimal tests before 👍 🍺

[stefsmeets]

Yeah, I could not find any tests so I did not bother but I can add a couple next week. 👍

[valeriupredoi]

cheers dude! Lemme know if you got time, if not I can do that, been doing a lot of maintenance and test stuff lately anyway 👍

[stefsmeets]

Hi @valeriupredoi , I added a couple of tests to cover the functionality of module. Does this work for you?

[valeriupredoi]

very cool @stefsmeets - 100% coverage too 🍺