speechToText method
Convert speech to text with full configuration support
request - The speech-to-text request
cancelToken - Optional token to cancel the request
Throws UnsupportedError if not supported. Check supportedFeatures first.
Implementation
@override
Future<STTResponse> speechToText(
  STTRequest request, {
  CancelToken? cancelToken,
}) async {
  return audio.speechToText(request, cancelToken: cancelToken);
}