[Unity Engine] Mapbox SDK functions

Hello, If you are familiar with Mapbox SDK inside Unity; I need to modify the AbstractMap that comes from demo scenes.

- [ ] Get the extent of the map (width and height in meters).
- [ ] Get the corners of the map coordinates in geographical coordinates and meters.
- [ ] Place an item using geographical coordinates into the map (not POI).
- [ ] On the map click to get the coordinates of the hit place (raycasting).
- [ ] Enable offline functionality for navigation.

- [ ] Check the possibility to set the zoom at 15 but get the highest resolution of satellite imagery possible. (The more that I zoom the more that the map reduces in tile sizes).
- [ ] Find a good relationship between sample count and zoom of the map.

In general, the last two points seek to find the best resolution Mapbox can give in both imagery and terrain quality.