Add support for extra options like Thumbs for Google TTS

Add support for extra options for Google TTS, so that we can send to Google speaker or Google Hub (Or another media player) Title and Thumb.

Like:

service: tts.google_translate_say
data:
  entity_id: media_player.nest_mini
  message: My name is Andrew
  cache: false
  options: 
    extra:
      title: "Name"
      thumb: "/local/images/google/name.jpg"

And get instead:
image

This is roughly the picture:
image