[Feature request] make cubejs as datasouce of DB-GPT

[lordk911]

Is your feature request related to a problem? Please describe.
I saw an example of making cubejs and LLM work together langchain
Here is a text-to-sql project based on LLM DB-GPT , I think make cubejs as a datasouce of DB-GPT will be helpful, Will accelerate the maturation of text-to-sql

[lordk911]

I've made a initial PR: eosphoros-ai/DB-GPT#1466

[github-actions]

If you are interested in working on this issue, please provide go ahead and provide PR for that.
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