GMSMapView SwiftUI Implementation

[waynewbishop]

GMSMapView SwiftUI Implementation

This PR introduces a modern SwiftUI wrapper around GMSMapView that simplifies integration of Google Maps into SwiftUI applications. The implementation provides a declarative API through custom view modifiers for common map configurations like adding markers and handling user interactions.

The GoogleMapViewDelegate has been designed to use closure-based callbacks, making it easier to handle map events in a SwiftUI-friendly way. The overall architecture emphasizes type safety and follows SwiftUI best practices for state management and view updates.

[wangela]

Where are the demo names and descriptions (e.g. where are they defined to be visible when running the demo app)? I'm trying to figure out how you differentiate between "MapWithMarker" and "MapWithMarkers"

[wangela]

To add:

• BasicMapWithMapID
• Add mention of this folder to README

[waynewbishop]

To add:

• BasicMapWithMapID
• Add mention of this folder to README

Changes complete. These include:

• A new BasicMapWithMapID sample
• New updates to Readme.md supporting the addition of the new GoogleMaps-SwiftUI sub-directory.