title: Using gcloud speech api for real-time speech recognition in dart, flutter
body: <p>I want to use Google's real-time speech recognition api in a flutter project, written in dart.
  I've activated a gcloud account, created the api key (which should be the only necessary authentication method for google speech) and written a basic apk which ought to send an audio stream to Google cloud and display the response.
  I imported the googleapis/speech and googleapis_auth plugin.</p>
  
  <p>But I couldn't figure out how to set it up.
  They say you have to use gRPC, which makes sense as it should make it easy to use, but the implementation of their plugin on github doesn't seem to use it.</p>
  
  <p>So can anyone tell me how to use it - setting up authentication and transcribing a speech?</p>