### What problem does this PR solve?

This PR organize chunks in the prompt by document and indicate what is
the name of the document in this way

```
Document: {doc_name} \nContains the following relevant fragments:
chunk1
chunk2
chunk3

Document: {doc_name} \nContains the following relevant fragments:
chunk4
chunk5
```

Maybe can be a baseline to add metadata to the documents.

This allow in my case to improve llm context about the orgin of the
information.


### Type of change

- [X] New Feature (non-breaking change which adds functionality)

Co-authored-by: Miguel <your-noreply-github-email>