Ability to use reverse geocoding

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

We were working on a module last year where you could not only add pins to the map of a proposal by the simple address geocoding, but also by clicking the map, which used the coordinates of the pins to fetch the addresses for the form. Simple geocoding was handled using the tools Decidim offered, but with the reverse geocoding we had to build the code from scratch.

Describe the solution you'd like
At the moment Decidim only supports address geocoding which allows the user to input an address and get the coordinates for it. However having reverse geocoding possibility ready in Decidim would benefit developers that want to create new modules for example.

Could this issue impact on users private data?
No

Something similar was proposed here: Position cursor on map to enter address

Other similar:
https://meta.decidim.org/processes/roadmap/f/219/debates/231