Add a new datastore hippo for chatgpt-retrieval-plugin

[chocolate4]

I would like to propose a new vector database to be included in the chatgpt-retrieval-plugin ecosystem. Below is the official link to our vector database.

https://www.transwarp.cn/starwarp

Motivation
I hope that everyone can more conveniently use Hippo + chatgpt-retrieval-plugin to build AI Agents.