Add text to audio task (#969)
* add text to audio task.
* add text-to-audio to serveJS.ts
* add text-to-audio inputs snippet.
* add text-to-audio to serveCurl.ts
* add text-to-audio in tasks specific files.
* enabling text-to-audio widget.
* fix failing InferenceWidget test.
* format
* remove TextToAudio specific copied code.
* fix style.
* fix style. x2
* PipelineIconAudio -> PipelineIconSpeech.
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Co-authored-by: Mishig Davaadorj <dmishig@gmail.com>
