Add Vokan to evaluation queue

vokan.json

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+{"model_name": "Vokan", "display_name": "[Vokan](https://dagshub.com/blog/styletts2/)[\ud83e\udd17](https://huggingface.co/ShoukanLabs/Vokan)", "model_tags": ["Non-autoregressive", "Prosodic Correlates", "Adversarial", "Diffusion", "Reference-based (Speaker)"], "web_url": "https://dagshub.com/blog/styletts2/", "hf_url": "https://huggingface.co/ShoukanLabs/Vokan", "code_url": "", "paper_url": "", "inference_details": "", "status": "pending"}