PPS product and level1c collector

[ninahakansson]

Add a PPS l1c collector that adds PPS lvl1c files to messages with PPS products

• Closes #xxxx
• Tests added
• Tests passed: Passes pytest nwcsafpps_runner
• Passes flake8 nwcsafpps_runner
• Fully documented

[codecov]

Codecov Report

Attention: Patch coverage is 66.33663% with 34 lines in your changes are missing coverage. Please review.

Project coverage is 75.73%. Comparing base (5354d27) to head (cf08616).
Report is 27 commits behind head on main.

❗ Current head cf08616 differs from pull request most recent head 0fe3526. Consider uploading reports for the commit 0fe3526 to get more accurate results

Files	Patch %	Lines
nwcsafpps_runner/pps_collector_lib.py	0.00%	26 Missing ⚠️
nwcsafpps_runner/message_utils.py	79.48%	4 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #62      +/-   ##
==========================================
+ Coverage   74.24%   75.73%   +1.49%     
==========================================
  Files          15       17       +2     
  Lines        1778     1871      +93     
  Branches      266      164     -102     
==========================================
+ Hits         1320     1417      +97     
+ Misses        419      415       -4     
  Partials       39       39              

Flag	Coverage Δ
unittests	75.73% <66.33%> (+1.49%)	⬆️

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