Feature #1514 MADIS2NC wrapper

[georgemccabe]

Unrelated changes in this PR:

• Removed large image files that are no longer included in documentation
• Changed file permissions for image files to remove unnecessary executable permissions
• Updated Contributor's Guide content about creating a new wrapper and basic components of a wrapper to include more accurate, up-to-date information.

Pull Request Testing

• [X] Describe testing already performed for these changes:
  

Added unit tests, ran new basic use case

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

• Confirm all automated tests pass (except land_surface:0 which is failing to an unrelated issue)

• Review new use case documentation: https://metplus.readthedocs.io/en/feature_1514_madis2nc/generated/met_tool_wrapper/MADIS2NC/MADIS2NC.html

• Review new Contributor's Guide content (if time permits): https://metplus.readthedocs.io/en/feature_1514_madis2nc/Contributors_Guide/create_wrapper.html

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

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

Added unit tests and basic use case

• [X] Will this PR result in changes to the test suite? [Yes]
  If yes, describe the new output and/or changes to the existing output:
  

The new MADIS2NC basic use case will produce new output that will require the truth data to be updated. We will need to coordinate with @DanielAdriaansen and @JohnHalleyGotway to determine if the land_surface:0 should be disabled until it can be fixed before updating the truth data.

• [X] Do these changes introduce new SonarQube findings? [No]
  If yes, please describe:

• [X] Please complete this pull request review by 5/20/2024.
  

Pull Request Checklist

See the METplus Workflow for details.

• [X] Add any new Python packages to the METplus Components Python Requirements table.
• [X] Review the source issue metadata (required labels, projects, and milestone).
• [X] Complete the PR definition above.
• [X] Ensure the PR title matches the feature or bugfix branch name.
• [X] Define the PR metadata, as permissions allow. Select: Reviewer(s) Select: Organization level software support Project or Repository level development cycle Project Select: Milestone as the version that will include these changes
• [x] After submitting the PR, select the :gear: icon in the Development section of the right hand sidebar. Search for the issue that this PR will close and select it, if it is not already selected.
• [ ] After the PR is approved, merge your changes. If permissions do not allow this, request that the reviewer do the merge.
• [ ] Close the linked issue and delete your feature or bugfix branch from GitHub.

[georgemccabe]

I noticed the SonarQube scan failed because it didn't like my new unit tests that are very similar to the tests for ASCII2NC. I'm working on a solution to use a pytest fixture to remove some of the redundant test code in the pytests for each wrapper to resolve this.