Bring back st_d_within for geographic lookups

[olmohake]

Component

c/v3-engine
c/v3-ndc-postgres

Is your proposal related to a problem?

In Hasura v2, geographic lookups were easily performed using st_d_within, allowing users to find relevant objects around a given location by providing a point and search radius.

In Hasura v3, only st_within is supported. As a result, performing similar lookups now requires generating the lookup geometry on the client side beforehand.

Describe the solution you'd like

Reimplement st_d_within.

Describe alternatives you've considered

Generating lookup geometries on the client side.

[robertjdominguez]

Thanks, @olmohake — tagging the appropriate team 👍