Allow direct listening to host/port in geographic gatherer.

[mraspaud]

This PR allows the user to provide a port and host for listening.

It also refactors the geographic gatherer a bit

[codecov[bot]]

Codecov Report

Merging #105 (9cf5182) into main (f7326f8) will increase coverage by 1.43%. The diff coverage is 92.30%.

@@            Coverage Diff             @@
##             main     #105      +/-   ##
==========================================
+ Coverage   88.14%   89.58%   +1.43%     
==========================================
  Files          25       25              
  Lines        3433     3609     +176     
==========================================
+ Hits         3026     3233     +207     
+ Misses        407      376      -31     

Impacted Files	Coverage Δ
pytroll_collectors/logging.py	0.00% <0.00%> (ø)
pytroll_collectors/triggers/__init__.py	66.66% <ø> (+9.52%)	:arrow_up:
pytroll_collectors/triggers/_watchdog.py	58.62% <50.00%> (+18.96%)	:arrow_up:
pytroll_collectors/geographic_gatherer.py	85.49% <80.51%> (-1.22%)	:arrow_down:
pytroll_collectors/triggers/_base.py	79.52% <92.30%> (+4.71%)	:arrow_up:
pytroll_collectors/region_collector.py	86.34% <96.00%> (+1.34%)	:arrow_up:
...troll_collectors/tests/test_geographic_gatherer.py	98.04% <99.43%> (-1.96%)	:arrow_down:
pytroll_collectors/tests/test_triggers.py	100.00% <100.00%> (+7.04%)	:arrow_up:
pytroll_collectors/triggers/_posttroll.py	93.58% <100.00%> (+3.02%)	:arrow_up:
... and 3 more

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