Add --log-config support via yaml configuration file

[adybbroe]

Add --log-config support to geographic_gatherer and segment_gatherer and initialize logging via shared setup_logging()

[codecov]

Codecov Report

❌ Patch coverage is 76.22378% with 34 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.92%. Comparing base (d5fa6fa) to head (9f75b2f).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
pytroll_collectors/logging.py	55.00%	18 Missing ⚠️
pytroll_collectors/scripts/geographic_gatherer.py	0.00%	4 Missing ⚠️
pytroll_collectors/scripts/trollstalker.py	0.00%	4 Missing ⚠️
pytroll_collectors/region_collector.py	83.33%	3 Missing ⚠️
pytroll_collectors/utils.py	76.92%	3 Missing ⚠️
pytroll_collectors/scripts/segment_gatherer.py	0.00%	1 Missing ⚠️
pytroll_collectors/trollstalker.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #177      +/-   ##
==========================================
+ Coverage   80.73%   80.92%   +0.19%     
==========================================
  Files          41       41              
  Lines        5140     5207      +67     
==========================================
+ Hits         4150     4214      +64     
- Misses        990      993       +3     

Flag	Coverage Δ
unittests	80.92% <76.22%> (+0.19%)	⬆️

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[mraspaud]

Closes #171