rag_agent library

1. rag package
2. documentation
3. rag_agent.dart

rag package

1. Libraries
2. gen/artifacts.gen
3. gen/exports.gen
4. query_tool
5. rag
6. rag_agent
7. spaces/fire_space
8. spaces/pinecone_space
9. spaces/qdrant_space
10. vector_space