[GSK-2540, GSK-2558, GSK-2663] RAG toolset

[pierlj]

• Add the correctness evaluator and associated tests.
• Add a generator class KnowledgeBaseTestsetGenerator in the giskard/rag module.
• Add utilities to build a knowledge base inside the generator. This include VectorStore, Document and OpenAIEmbeddings classes. These are highly inspired from langchain, but much simpler.
• Add tests for all these classes.

[linear]

GSK-2540 Implement evaluators linked test set generation in Giskard

[mattbit]

Looks good, thanks! I will try it out locally before merging.

[linear]

GSK-2558 Giskard RAG toolset

[sonarqubecloud]

Quality Gate passed

Issues
5 New issues

Measures
0 Security Hotspots
77.2% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud