Add support for RAG

[sa-]

Is your feature request related to a problem? Please describe. RAG (or AI question answering)

Describe the solution you'd like

In the config object the interface could be defined like this

const config = {
  ...,
  retrieval_augmented_generation: {
    "provider_type": "anthropic|openai|huggingface|mistral|cohere|bedrock|etc",
    "base_url": "elastic.co",
    "api_key": "changeme",
    "prompt_template": "The user searched for: {{query}} \n Answer only from this context\n\n{{context}}",
    "num_results_in_context": 20
  },
  ...
}

Describe alternatives you've considered n/a

Additional context Something that looks like this