Feature Request

Is your feature request related to a problem? Please describe.

Currently, Web Chat (or Cognitive Services) will finalize the speech recognition result when it hit a period of silent. This is good for PC but not great for mobile scenarios where streets are noisy.

Push-to-talk will improve UX for mobile scenario.

Describe the suggestion or request in detail

Instead of push-and-talk, provide a push-to-talk button. When the button is pressed, the speech recognition engine is listening. When the button is released, the speech recognition engine will be stopped (thru SpeechRecognition.stop() instead of SpeechRecognition.abort()).

Describe alternatives you have considered

There are no alternatives.

Additional context

[Enhancement]