Support Location Override

[teganscott]

Enable native location override to take incoming user locations and pass it through into mapbox. Trying to override the current experience using layers to mock a blue dot and shifting the camera to follow the blue dot feels inauthentic leading to a poor user experience.

Current limitation

• The Flutter SDK does not expose location.override(provider:) (iOS) or overrideLocationProvider (Android).
• FollowPuckViewportState follows Mapbox's internal GPS provider.

Desired behaviour

• Provide an API to override the location provider in Flutter.
• Allow injecting external location updates (lat, lon, accuracy, heading) from Dart into the overridden provider.
• When overridden, Mapbox GPS should not be active
• FollowPuckViewportState should smoothly follow the injected locations, preserving the current UX.

[huseyinsahinli]

we need this pls

[favazHF]

We would like to be able to access the puck coordinates (blue dot) in order to create functional polygons based on that position and have a better experience in our app. AccuracyRing does not work because we need to use that polygon to perform validations (what is currently available is only visual, not functional). It would be great to have this feature. Do you know if it is in the team's plans? @maios