[Feature Request]: Implement Self-RAG

[yingfeng]

Is there an existing issue for the same feature request?

• [X] I have checked the existing issues.

Is your feature request related to a problem?

No response

Describe the feature you'd like

Self-RAG is a strategy for RAG that incorperates self-reflection / self-grading on retrieved documents and generations.

Describe implementation you've considered

No response

Documentation, adoption, use case

No response

Additional information

No response