[Feature Request]: A function that is called when GPS signal is lost.

### Is there already an issue requesting this feature?

- [X] I have searched the [existing issues](https://github.com/baseflow/flutter-geolocator/issues).

### Please select affected platform(s)

- [X] Android
- [ ] iOS
- [ ] Linux
- [ ] macOS
- [ ] Web
- [ ] Windows

### Use case

In our app, we need to determine when was the last location received before we lost the GPS signal.

### Proposal

The Google Map and others alert by voice saying GPS signal lost.
Please add a function that is called when GPS signal is lost.

### Specific requirements or considerations

_No response_

### Additional information or context

_No response_