SpeechToTextProvider class

Simplifies interaction with SpeechToText by handling all the callbacks and notifying listeners as events happen.

Here's an example of using the SpeechToTextProvider

var speechProvider = SpeechToTextProvider( SpeechToText());
var available = await speechProvider.initialize();
StreamSubscription<SpeechRecognitionEvent> _subscription;
_subscription = speechProvider.stream.listen((recognitionEvent) {
  if (recognitionEvent.eventType == SpeechRecognitionEventType.finalRecognitionEvent )  {
      print("I heard: ${recognitionEvent.recognitionResult.recognizedWords}");
    }
  });
speechProvider.addListener(() {
  var words = speechProvider.lastWords;
});