Add map to iOS app

[dellisd]

Add a map to the iOS app's main screen centered around the Carleton University campus.

This map should be added using SwiftUI. Mapbox has a good tutorial on integrating the Mapbox MapView with Swift UI. The Annotations section can be omitted, however you should add a layer to the map with a random feature visible.

The Mapbox access token should be provided programmatically by importing it from the Common framework.

This is blocked by #3