Refactor: Single LocationOfInterestModel

[scolsen]

This commit simplifies and updates our model for locations of interest:

• We retain only a single LocationOfInterest data class that accepts a geometry in its constructor.
• The Builder for this class has been removed.
• We now return the type of the LocationOfInterest based on its geometry.
• The AreaOfInterest and PointOfInterest classes have been removed.

In addition, I've added some extensions for working with the Point model while it still exists, and I've converted FakeData to kotlin.