List all of the expressive avatars

Example response

{
  "avatars": [
    {
      "name": "John Doe",
      "sentiments": [
        {
          "sentiment": "happy",
          "description": "An enthusiastic, expressive avatar full of charm and personality.”",
          "voice": {
            "voice_id": "en-US-JennyNeural",
            "voice_config": {
              "rate": "0.5",
              "pitch": "+2st"
            },
            "language": "English (United States)"
          }
        }
      ]
    }
  ]
}