feat: add dynamic documents

[marieaurore123]

Currently, when an agent needs to execute a vector search, we pass the vector store index as a parameter to the agent (with dynamic_context) and the agent executes said vector search internally.

The problem I am facing with my use case is that the rig app needs access to the results of the vector search separately from the RAG process. Ex:

1. Execute vector search
2. Rig app does stuff with the vector search result
3. Rig app sends vector search results to agent --> agent adds RAGged documents to context window

Right now, step 2 is not possible, unless vector search is executed twice.

Proposed solution

• Execute the vector search outside of the agent and have the option to pass the results of the vector search to the agent (instead of doing the vector search inside).
• Add dynamic_documents: Vec<Document> to the agent

[cvauclair]

What is the difference between this and the existing static_context documents?