Data oep upload enhancements

[jnnr]

These are possible todos taken from #259

• [ ] update metadata template (current is 1.5.0
• [ ] Use new checking functionality as described in https://github.com/rl-institut/oemof-B3/pull/259#discussion_r1034995406
• Set metadata
  • [ ] Fill in IsAbout (ontological annotation) in script
• [ ] How to handle updated data?
  • [ ] Notify about existing data on oep and ask if the user wants to overwrite
  • [ ] Or: Allow to append. Implement a get_id function? Optional non-priority
• [ ] Could check locally that data and metadata match using omi.
• [ ] Allow to delete tables on oep (oep delete button will come, so this may be obsolete soon)
• [ ] Could use one .json to describe several .csv by making use of "resources" entry.