Maddy RAG-based LLM first-pass editorial review: to be tech reviewed - this replaces PR #1528 [Adding RAG-based LLM LP].

[madeline-underwood]

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[madeline-underwood]

@nobelchowdary I've done a very light editorial review of this (not much to do, really). This will go through technical review and I'll then do another final check before we publish. Thanks all.