Make publish topic for pps posttroll hook patternable

[mraspaud]

This PR allows the publish topic of pps posttroll hook to be a pattern which will be filled with some metadata.

• [x] Tests added
• [x] Tests passed: Passes pytest nwcsafpps_runner
• [x] Passes flake8 nwcsafpps_runner
• [x] Fully documented

[codecov[bot]]

Codecov Report

Merging #30 (e271c64) into main (a622f50) will increase coverage by 0.27%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #30      +/-   ##
==========================================
+ Coverage   48.96%   49.24%   +0.27%     
==========================================
  Files          14       14              
  Lines        1640     1649       +9     
  Branches      216      213       -3     
==========================================
+ Hits          803      812       +9     
  Misses        825      825              
  Partials       12       12              

Flag	Coverage Δ
unittests	49.24% <100.00%> (+0.27%)	:arrow_up:

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Impacted Files	Coverage Δ
nwcsafpps_runner/pps_posttroll_hook.py	77.10% <100.00%> (-0.14%)	:arrow_down:
nwcsafpps_runner/tests/test_pps_hook.py	100.00% <100.00%> (ø)

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[adybbroe]

For me the decrease in coverage is neglible - as far I can see you have added the kind of testing necessary for the refactoring