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 67.74194% with 40 lines in your changes missing coverage. Please review.

Project coverage is 75.67%. Comparing base (5354d27) to head (cf804bd).
Report is 27 commits behind head on main.

Files with missing lines	Patch %	Lines
nwcsafpps_runner/pps_collector_lib.py	0.00%	28 Missing ⚠️
nwcsafpps_runner/message_utils.py	79.48%	4 Missing and 4 partials ⚠️
nwcsafpps_runner/pps_posttroll_hook.py	55.55%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #62      +/-   ##
==========================================
+ Coverage   74.24%   75.67%   +1.43%     
==========================================
  Files          15       16       +1     
  Lines        1778     1879     +101     
  Branches      266      160     -106     
==========================================
+ Hits         1320     1422     +102     
+ Misses        419      415       -4     
- Partials       39       42       +3     

Flag	Coverage Δ
unittests	75.67% <67.74%> (+1.43%)	⬆️

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