[Code health] Abstract Maps API LatLng* with custom model class

[gino-m]

trafficstars

We shouldn't expose Maps API to Ground business logic, both to enforce SoC/Clean arch, and to allow us to add other maps providers in the future.

[gino-m]

@jsunde We can now use Coordinate for this.

[shobhitagarwal1612]

@gino-m Can this be closed?

[gino-m]

Yes, it looks like we now pass Point instead. Thanks!