Event generation tweaks

[infotroph]

Description

• Include all 4 params in harvest events
• Move schema out of data/ to shut up R CMD check
• Specify ensemble_id as a string
• Quiet an unrelated deprecation warning in the data.land tests while I was looking at it

Motivation and Context

Review Time Estimate

• Immediately
• Within one week
• When possible

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My change requires a change to the documentation.
• My name is in the list of CITATION.cff
• I agree that PEcAn Project may distribute my contribution under any or all of
  • the same license as the existing code,
  • and/or the BSD 3-clause license.
• I have updated the CHANGELOG.md.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[dlebauer]

Thanks!

[infotroph]

@dlebauer Since this is a PR into your fork, you'll need to do the merge