restructure obs_suite lotus scripts

[ludwiglierhammer]

see #74

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 55.39216% with 91 lines in your changes missing coverage. Please review.

Project coverage is 15.34%. Comparing base (921d2d4) to head (391271a).

Files with missing lines	Patch %	Lines
..._processing/obs_suite/lotus_scripts/level_slurm.py	0.00%	74 Missing ⚠️
...mod_marine_processing/obs_suite/scripts/level1b.py	61.90%	8 Missing ⚠️
..._marine_processing/obs_suite/scripts/_utilities.py	85.18%	4 Missing ⚠️
...mod_marine_processing/obs_suite/scripts/level1c.py	88.00%	3 Missing ⚠️
...mod_marine_processing/obs_suite/scripts/level1e.py	91.30%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #79      +/-   ##
==========================================
- Coverage   16.84%   15.34%   -1.51%     
==========================================
  Files          41       39       -2     
  Lines        7063     6920     -143     
==========================================
- Hits         1190     1062     -128     
+ Misses       5873     5858      -15     

Flag	Coverage Δ
unittests	15.34% <55.39%> (-1.51%)	⬇️

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