Metadata validation

[marcolarosa]

• [ ] add a control to pick ro crate version to conform to
• [ ] validate metadata to confirm it meets the absolute minimum requirements of that ro crate version:
  • [ ] name, description datePublished, publisher etc (TBD)
  • [ ] checks entity ids are sensible and as expected: ORCID etc
• [ ] if a profile is in use, validate metadata against the profile selection to ensure all required properties have input