ExLlamaV2: exl2 support

If is possible ExLlamaV2 is a very fast and good library to Run [LLM](https://mlabonne.github.io/blog/posts/ExLlamaV2_The_Fastest_Library_to_Run%C2%A0LLMs.html)

[ExLlamaV2 Repo](https://github.com/turboderp/exllamav2)