refactor: add some desc in chatbot settings

[530051970]

Fixes #

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Description

This pull request introduces modifications to the rag.py file in the langchain_integration module and the ChatBot.tsx file in the portal application. The changes aim to enhance the integration between the Retrieval Augmented Generation (RAG) model and the chatbot interface, providing improved conversational capabilities.

The rag.py file has been updated to optimize the retrieval and generation processes, ensuring more relevant and coherent responses from the RAG model. Additionally, error handling and input validation have been improved for increased robustness.

In the ChatBot.tsx file, the user interface has been modified to better display the responses generated by the RAG model. This includes formatting enhancements, improved layout, and better handling of long responses.

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: 2, 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	1 added, 1 removed	The code change modifies the default value of top_k from Threshold.TOP_K to Threshold.TOP_K_RETRIEVALS for the retriever configuration.
source/portal/src/pages/chatbot/ChatBot.tsx	14 added, 4 removed	The code changes involve modifying the layout and adding descriptions to various form fields in the ChatBot component. The grid layout for the form fields has been updated, and descriptions have been added to fields such as scenario, model name, max tokens, max rounds, endpoint, temperature, top K retrievals, and score using the description prop.