Introduce Zustand Store

[ErikSin]

For state management, introduce a Zustand Store. This will be initially used for the Background Map Manager

To do

• [ ] install Zustand
• [ ] Create Background Map Store (see MapStore type below)
• [ ] Add persistance middleware
• [ ] Persisted state needs to be versioned (for migration purposes)

type MapStore = {
    mapStyle:string,
    setMapStyle:(style:string) => void
}