chatbot-server-mongodb-public-v0.12.1

• (EAI-601): Add retrieval evals from verified answers (#554) (377046f)
• (EAI-604): Fix NDCG metric (#555) (6098b7b)
• (EAI-602): Refactor preprocessing to support retrieval evals (#552) (8eb9ec9)
• (EAI-581): Chatbot verified answers eval/improvments + export mongodb-rag-core/dataSources (#550) (37be250)
• (EAI-599,EAI-600): Retrieval evaluation and scorers (#551) (ab9596d)
• Support /exports from mongodb-rag-core (#548) (aaa1cce)
• (EAI-587): Clean up shared imports in mongodb-rag-core + migrate @azure/openai to openai (#546) (3eb647d)