Allow to recover Google Map state

## Feature Request

### Plugin
- @capacitor/google-maps

### Description
The map object must have a method that allows recovering the current state of the map (zoom levels, tilt...).

### Platform(s)
- Web
- Android
- iOS

### Preferred Solution
A method to retrieve the entire current state, or simply make its attributes public.

### Additional Context
It is useful when you want to offer different functions depending on the state of the map. For example, show or hide buttons depending on the zoom level.