Added crop functionality to trollflow2

[Vpirm9]

An addition for using the scene.crop() functionality from satpy has been added to trollflow2. It can be called in the trollflow2.yamlfile with- fun: !!python/name:trollflow2.plugins.crop. This functionality was implemented because I was tasked with cropping geostationary data and saving it to the local archive. The aim of this approach was to preserve the data in its original form while reducing overall storage space by retaining only the data over the region of interest.

The crop() function was added, which uses the same output job["resampled_scenes"] as `resample(), so they cannot be used simultaneously. However, no situations have been identified where using both functions at the same time would be necessary.

• Closes #xxxx
• Tests added
• Tests passed
• Passes flake8 trollflow2
• Fully documented
• Add your name to AUTHORS.md if not there already

[pnuu]

Could you add some unit tests for the new feature? Also add documentation for the new plugin to doc/source/plugins.rst.

[codecov]

Codecov Report

Attention: Patch coverage is 8.33333% with 11 lines in your changes missing coverage. Please review.

Project coverage is 95.43%. Comparing base (b72a3f5) to head (34ddb14).
Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
trollflow2/plugins/__init__.py	8.33%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #210      +/-   ##
==========================================
- Coverage   95.78%   95.43%   -0.35%     
==========================================
  Files          12       12              
  Lines        2989     3001      +12     
==========================================
+ Hits         2863     2864       +1     
- Misses        126      137      +11     

Flag	Coverage Δ
unittests	95.43% <8.33%> (-0.35%)	⬇️

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