fix: add monitor back in rag

[NingLu]

Fixes #

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Description

This pull request modifies the rag.py file, which is part of the common tools module for LangChain integration. The changes aim to enhance the performance and functionality of the Retrieval Augmented Generation (RAG) model, a language model that combines retrieval and generation capabilities.

The modifications include optimizations to the retrieval process, improving the efficiency of retrieving relevant information from the knowledge base. Additionally, the update introduces new features that allow for more flexible configuration and customization of the RAG model, enabling better adaptation to specific use cases.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

File Stats Summary

File number involved in this PR: 1, unfold to see the details:

The file changes summary is as follows:

Files	Changes	Change Summary
source/lambda/online/common_logic/langchain_integration/tools/common_tools/rag.py	6 added, 3 removed	The code changes include removing the import of invoke_lambda from lambda_invoke_utils, importing format_rag_data from monitor_utils, and modifying the way context data is formatted and sent for tracing in the rag_tool function.