SearchKit - add address proximity (map radius) search

[colemanw]

Overview

Allows searching for addresses within a given distance of a location.

Notes

Update: now works with most mapping providers (originally hardcoded only for Google Maps) via #23646

[civibot]

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[eileenmcnaughton]

[eileenmcnaughton]

ok let's merge it - it would be good to test in the rc (I'm fighting geocoders right now) and it shouldn;'t affect existing code

[demeritcowboy]

Ok just I had marked it merge-ready to give the mystery sponsor time to see if it worked for their use case.

[eileenmcnaughton]

Well it can get further fixes if need be

[awestuk]

That's us! We will test asap - we need to run an upgrade first, so we're just waiting for the security drop. It looks like just what we're after though.

[colemanw]

One thing I'll note about this PR is that it only works with Google. (which, afaik is the only geocoder that actually works with CiviCRM at the moment, but still noteworthy)
Update That's no longer the case thanks to #23646

[awestuk]

Upgraded and tested and working well! Does exactly what we wanted. Thank you!