Feature 560 mode field plot

[bikegeek]

Pull Request Testing

• Describe testing already performed for these changes:
  
  generated pytests to verify plots are generated

• Recommend testing for the reviewer(s) to perform, including the location of input datasets, and any additional instructions:
  

code is set up on 'seneca': /d1/projects/MODE_Field_Plot with instructions for setting up PYTHONPATH, conda environment to use, and running the plot

• Do these changes include sufficient documentation updates, ensuring that no errors or warnings exist in the build of the documentation? [Yes]

User Documentation: ReadtheDocs.io
https://metplus.readthedocs.io/projects/metplotpy/en/feature_560_mode_field_plot

• Do these changes include sufficient testing updates? [Yes]

• Will this PR result in changes to the test suite? [No]
  
  If yes, describe the new output and/or changes to the existing output:
  

• Do these changes introduce new SonarQube findings? [Yes]
  
  If yes, please describe:

Quality gate threshold for test coverage may not be met

• Please complete this pull request review by [for beta3 release Oct].
  

Pull Request Checklist

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• Add any new Python packages to the METplus Components Python Requirements table.
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