Vector store other than azure ai search

[pavanannamraju]

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Hello,

Is there any way I can use other vector stores than azure ai search? In ragtools.py, I see search client with ai search, I can replace that code with my vector db, but with the tools i am not sure if they work.

This issue is for a: (mark with an x)

- [ ] bug report -> please search issues before submitting
- [x] feature request
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)

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