Add Location Widget (a.k.a GPS picker) to FHIR Core

[f-odhiambo]

What's the difference between a location widget and a Geo-widget?
From a tech perspective, they are the same thing. They pick location GPS data but from a UI perspective, they are different. Geo Widget will use the map to pick the location data. Done is FHIR Core #1536

Location widget can have 2 variants

1. Show a drop-down or location tree. This helps you select the locations already saved on the app. It mostly visualizes the location hierarchy on a form.
2. This is an input field on a form that will pick the GPS coordinates and fill in LAT & LONG input fields in the form.|

Point 2 can be a simple button that gets the (Lat, Long) when clicked or be what Ona Data did here

Opened this ticket to track the SDK issue - google/android-fhir#800

[ageryck]

This is fixed by this #3046