get Available Voice List
open fun getAvailableVoiceList(@NonNull() callback: VoiceDownload.AvailableVoicesCallback)
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Returns all available voices. The callback will be called on main thread.
open fun getAvailableVoiceList(@NonNull() callback: VoiceDownload.AvailableVoicesCallback, @Nullable() executor: Executor)
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Returns all available voices. The callback will be called on provided executor or on mainthread if null.