A Postgrex types module registering the PostGIS extension, for hosts that do not already define one.
No :json option is passed, so Postgrex resolves the JSON library itself
from config :postgrex, :json_library, defaulting to Jason. :geo_genius
depends on Jason for its own manifest files but does not choose a library for
its host: a host on Elixir 1.18 or later that configured the built-in JSON
keeps it, and every read projects codes and attributes as jsonb through
whichever library the host chose.
A host with its own types module adds Geo.PostGIS.Extension to that
instead and points its Repo at it; either way the Repo must be able to
decode geometry and jsonb before GeoGenius.Preflight will let it boot. See
guides/reading.md.