Add LLM Support to Query Box

On DoltHub, the query box could be used as a general purpose query generation engine.

You can either type sql or plain text and we use the database schema and other context to try and generate a SQL query. We can also use the LLM if the SQL query is not quite right and didn't parse. We can run the same SQL generation prompt and automatically correct it and run the corrected one instead....or we could just do "did you mean?".

I think on the backend this would have to be an open source model we could run as a service ourselves because of DoltLab.