LPS-44763 Include geolocation field in DDM

Hey Bruno,

This is part of a story to include a geolocation field in DDM so Web Content, DDL and Documents can benefit of this feature. 

This story is just to create a new field in DDM and store this information. 

I sent you this pull because as far as I saw you are the one who included fields in DDM. Let me know if you have any question and feel free to fwd it to Brian or whoever is necessary.

Thanks!