Why

This PR adds the ability to control the Apple Maps appearance (light/dark mode) independently from the app's color scheme.

Currently, the map follows the system/app appearance automatically. However, there are use cases where developers want to force a specific appearance for the map regardless of the app's theme - for example, displaying a light map in a dark-themed app for better visibility, or vice versa.

This addresses a common request for more granular control over map styling.

How

Added a new colorScheme prop to AppleMaps.View with three options:

• AUTOMATIC (default) - Map follows the system's color scheme
• LIGHT - Map is always displayed in light mode
• DARK - Map is always displayed in dark mode

Test Plan

1. Add userInterfaceStyle prop to an AppleMaps.View:

import { AppleMaps } from 'expo-maps';

<AppleMaps.View
  style={{ flex: 1 }}
  colorScheme={AppleMaps.MapColorScheme.DARK}
  cameraPosition={{
    coordinates: { latitude: 37.7749, longitude: -122.4194 },
    zoom: 12,
  }}
/>

2. Test each value:

   • AUTOMATIC - Map should follow app appearance
   • LIGHT - Map should always be light, even when app/system is in dark mode
   • DARK - Map should always be dark, even when app/system is in light mode

3. Verify that the rest of the app's UI is not affected by the map's colorScheme setting.

Checklist

• I added a changelog.md entry and rebuilt the package sources according to this short guide
• This diff will work correctly for npx expo prebuild & EAS Build (eg: updated a module plugin).
• Conforms with the Documentation Writing Style Guide