Add h3 to the extensions list

[kav]

Feature request

(sorry if this is a bit short... Lost a draft of this)

Is your feature request related to a problem? Please describe.

I'd love to be able to use h3 for geospatial. Here's some details on why it's awesome (and it definitely is)
https://www.gislounge.com/h3-open-source-geospatial-indexing-system/

Describe the solution you'd like

Add the h3 extension to the available extension list https://github.com/bytesandbrains/h3-pg

Describe alternatives you've considered

Self hosting, handling h3 on the front end, using PostGIS (very heavy for our use cases which are much more similar to the h3 use cases than have geospatial ones)

Additional context

https://www.gislounge.com/h3-open-source-geospatial-indexing-system/
https://h3geo.org/
https://h3geo.org/docs

[kav]

Sounds like the right place to register interest is here if folks want to give it some love #679