support rerank from localAI

[shuther]

Self Checks

• [X] I have searched for existing issues search for existing issues, including closed ones.
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1. Is this request related to a challenge you're experiencing?

Need to support rerank with self hosted approach

2. Describe the feature you'd like to see

leverage localAI for rerank as an option

3. How will this feature improve your workflow or experience?

good for self hosted and experimentations around rerank

4. Additional context or comments

localAI will support this feture soon, see https://github.com/mudler/LocalAI/pull/2121

5. Can you help us with this feature?

• [X] I am interested in contributing to this feature.

[takatost]

Feel free to contribute! 😁