integrate events into workflow

[dlebauer]

• Determine events spec
  • Formalizing the PEcAn Event Data Specification PecanProject/pecan#3551
  • Specification: https://gist.github.com/dlebauer/5a2e505bca6afe66ca6aa44d9dd163f7
• Ensure compatibility with inventory workflows and downscaling

Focus on minimal viable product to avoid premature optimization