Enable Background Map Selection

[ErikSin]

When Background Map Manager is enabled, allow user to select map. This selection should update the mapStyle in the zustand store. There are currently no designs for desktop, but the ones for mobile can be used and adapted to desktop.

Update the zustand store, but do not update the map in the observation view, that work will be done in #734 .

To Do:

• In Background Map Manager Screen, when a map is selected, add button Use Map. This button should update the mapStyle in the zustand store.

• In Observation View add a floating button, which open a modal with a list of available map styles. This button should only be seen when the feature flag is turned on.
• Create modal which list of available map styles should always have a default style (mapbox://styles/mapbox/outdoors-v10), and a list of all other available styles. This list should be generated by the useMapStylesHook().

[ErikSin]

Work left for sprint 12

• 1 full day of coding for sprint 12
• .25 day of review (from Erik)
• 1 full day of addressing review