Update logging

[cehbrecht]

Pull Request Checklist:

• This PR addresses an already opened issue (for bug fixes / features)
  • This PR fixes issue #xyz
• Tests for the changes have been added (for bug fixes / features)
• Documentation has been added / updated (for bug fixes / features)
• HISTORY.rst has been updated (with summary of main changes)
• I have added my relevant user information to AUTHORS.md

• What kind of change does this PR introduce?:

This PR updates the logging to use loguru.
This change was introduced in clisops>=0.9.0, see roocs/clisops#216

• Does this PR introduce a breaking change?:

• Other information:

[cehbrecht]

@Zeitsperre this is mainly a copy+paste from roocs/clisops#216. We can probably reduce some duplicates, like the tests._common.ContextLogger.

[Zeitsperre]

@cehbrecht Thanks and looks good! I'm hoping that this new engine solves a few of our problems.

If pytest supported class fixtures, the ConextLogger would be much better off as one. I've written a similar one into xclim (https://github.com/Ouranosinc/xclim/blob/9acbc72e8a22d3267929db3b88080c12b9f01288/xclim/testing/_utils.py#L35) that handles for the behaviour of loguru being enabled when xclim's version ends in beta.

If it can eventually be defined in a lower-level library (like, daops I suppose), we could then remove redundant definitions elsewhere.

[Zeitsperre]

@cehbrecht #93 should be compatible after the merge of this PR.