Use namespaced attributes for MapCameraPosition

[carson-katri]

Depends on liveview-native/liveview-client-swiftui#1240

This enables the following syntax for the MapCameraPosition type:

<Map
    position="region"
    position:latitude={34.011_286}
    position:longitude={-116.166_868}
    position:latitude-delta={0.2}
    position:longitude-delta={0.2}
/>