[Feature] Index-tts support

[ultranity]

确认清单

• 我已经仔细阅读项目文档，确认现有功能无法解决我的需求
• 我已经检索过现有issue，确认与现有issue的内容并不重复
• 确认并非问题讨论而是 Feature request

功能描述

Index-tts from Bilibili is also promising, would be nice if we can add it to Speech-AI-Forge :)
https://github.com/index-tts/index-tts

可能的解决方案

No response

[zhzLuke96]

IndexTTS 现在基本已经支持可用于推理，后续完善会在另一个 issues 跟踪 #229

这个issues我关闭了