Add SAM Audio STS model #89

Job	Run time
tests (STT, MLXAudioTests/MLXAudioSTTTests)	11m 18s
tests (VAD, MLXAudioTests/MLXAudioVADTests)	6m 29s
tests (TTS, MLXAudioTests/MLXAudioTTSTests)	6m 8s
tests (Codecs, MLXAudioTests/MLXAudioCodecsTests)	6m 1s
	29m 56s

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