search API - go over all fields/facets

[lanterno]

Update this API according to the discussion here
https://github.com/orgs/archetype-pal/discussions/6

Todo

• Add date range facet on thee Scribe model
• Rename the Graph model fields
  • Now, we can give things better names! (Need organization with the frontend)
• Decide what it means for a graph to be annotated. (in archetype2, this had a name)
• Optimize indexing DB calls using django queryset optimization techniques.
• return coordinates of the graph as JSON rather than string. make sure it's parse-able by the client.