List Voice Configurations

curl --request GET \
  --url http://localhost/api/v1/voice_configurations \
  --header 'Authorization: Bearer <token>'

{
  "voice_configurations": [
    {
      "name": "<string>",
      "speech_to_text": {
        "provider": "<string>",
        "watson_stt_config": {
          "api_url": "<string>",
          "api_key": "<string>",
          "model": "<string>"
        }
      },
      "text_to_speech": {
        "provider": "<string>",
        "watson_tts_config": {
          "api_url": "<string>",
          "api_key": "<string>",
          "voice": "<string>",
          "rate_percentage": 123,
          "pitch_percentage": 123,
          "language": "<string>"
        }
      },
      "voice_configuration_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "tenant_id": "<string>",
      "attached_agents": [
        {
          "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
          "name": "<string>",
          "display_name": "<string>"
        }
      ]
    }
  ]
}