Support JAIS models

[NightXBurn]

Thank you for your amazing work, do you plan to support JAIS models? The huggingface links are:
https://huggingface.co/inception-mbzuai/jais-13b
https://huggingface.co/inception-mbzuai/jais-13b-chat

Thank you

[SamujjwalSam]

Here's a fork of the original repo with Jais support: https://github.com/SamujjwalSam/vllm-jais/tree/jais
I could not create a pull request as I could make it work only with vLLM-v0.2.1-post1.

[esmeetu]

Closed this as #3183 has supported. And will release in v0.3.4.