Ability to set the geolocation metadata in various ways

[Lppsoeht]

Feature request:
Set default geolocation metadata to a fixed value or a random value inside a selected area(for example, a city).

[thestinger]

We could implement this, but for GrapheneOS it will be obsoleted by our plan to add a per-app replacement for mock location.

Someone filed GrapheneOS/os-issue-tracker#2403 but we should split it up.