Jalmogo/add tags

[jalMogo]

TODO:

• [x] add views for PlaceTags
  • [x] fetch
  • [x] create
• [x] add admin view for creating/editing tags
• [x] add admin view for creating/editing PlaceTags
• [x] update docker image
  • [x] fix tests
• [x] fix placed endpoint to return a better tag summary, eg: http://localhost:8001/api/v2/smartercleanup/datasets/pbdurham/places
• [x] deploy to staging
• [x] PlaceTag integrity
  • [x] don't show Tag from datasets outside the place in PlaceTag inline admin editor
  • [x] data validation - don't allow PlaceTag creation referencing Tags from another dataset
• [x] fix PlaceTag detail GET
• [x] fix bug with place editor
• [x] PlaceTag summary on a Place should just be the url, not a nested representation
• [x] add new models to staging
  • [x] add new tag models into pbdurham dataset
  • [x] add new 'tags' group permissions
• [ ] fix this error: https://sentry.io/mapseed/mapseed-dev-api/issues/858538738/?query=is%3Aunresolved
• [ ] do the same for prod