Fuzzy places

[camdendotlol]

Summary

This PR:

• adds some helper functions for generating features with circle geometry for fuzzy points
• updates the Typesense getFeatures helper function with the (optional) ability to get properties data from a custom path on the record object
  • this is so we can support properties on related records, as with geometry
• adds a new CertaintyLayer component that renders the certainty radii on the map
  • this only ended up being used in Core Data, as the Source component it relies on seems to rely on the existence of a React context that doesn't exist in Peripleo (which CDP uses)

[blms]

Looks good! I'm seeing a bit of what looks like repeated code between Map and CertaintyLayer where the circles are built and stored in the features array—any way that we could make that more DRY in case something needs to change later on? Fine if that's too much effort or there's a reason we can't.

[camdendotlol]

Oops, I DRYed it out yesterday afternoon but forgot to check in my changes.

[blms]

Looks good!