Add capability to monitor for silence in geographic gathering

[gerritholl]

Add an option to monitor for silence in geographic gathering. This adds a timeout calculation that is triggered at a certain time after the most recent message has arrived. This allows for early shipping if a reception system has stopped delivering earlier than expected or if the region is defined too large.

Work in progress. So far only the tests have been added.

• [x] Closes #86
• [x] Tests added
• [x] Fully documented

[codecov[bot]]

Codecov Report

Merging #89 (1bb84b8) into main (e6e95b0) will increase coverage by 0.18%. The diff coverage is 100.00%.

:exclamation: Current head 1bb84b8 differs from pull request most recent head bf5bf83. Consider uploading reports for the commit bf5bf83 to get more accurate results

@@            Coverage Diff             @@
##             main      #89      +/-   ##
==========================================
+ Coverage   83.33%   83.52%   +0.18%     
==========================================
  Files          19       19              
  Lines        2622     2652      +30     
==========================================
+ Hits         2185     2215      +30     
  Misses        437      437              

Impacted Files	Coverage Δ
pytroll_collectors/region_collector.py	82.23% <100.00%> (+0.72%)	:arrow_up:
...troll_collectors/tests/test_geographic_gatherer.py	100.00% <100.00%> (ø)
pytroll_collectors/tests/test_region_collector.py	94.59% <100.00%> (+1.73%)	:arrow_up:

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[gerritholl]

I'm currently field-testing this (along with #92, without which the geographic gatherer doesn't start).

[gerritholl]

Initial field-testing indicates it is not entirely working as expected, so I'm marking this as a draft again for now.