Refactor utils module

[pnuu]

This PR refactors the pyspectral.utils module.

• Closes #xxxx
• Tests added
• Tests passed: Passes pytest pyspectral
• Passes flake8 pyspectral
• Fully documented
• Add your name to AUTHORS.md if not there already

[codecov]

Codecov Report

❌ Patch coverage is 93.39623% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.35%. Comparing base (d4ea15a) to head (c2fe336).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
pyspectral/utils.py	93.39%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #265      +/-   ##
==========================================
+ Coverage   90.28%   90.35%   +0.06%     
==========================================
  Files          22       22              
  Lines        2523     2541      +18     
==========================================
+ Hits         2278     2296      +18     
  Misses        245      245              

Flag	Coverage Δ
unittests	90.35% <93.39%> (+0.06%)	⬆️

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[adybbroe]

Very nice work @pnuu , thanks!
Do we have test coverage of all this? Or do you want/need help there?

[pnuu]

Codecov shows that the code in the if isinstance(det_rsr[key], dict) branch moved to the new _collect_responses(det_rsr, key, det_wavenumbers) function isn't covered. The other part is the untouched logger setup. If you have ideas how to test the former, please do 👍