[langchain-sqlserver] Add support for storing chat history

[yorek]

Add support for chat_message_histories API.

This tutorial shows how message histories can be saved using LangChain:

https://python.langchain.com/v0.2/docs/how_to/message_history/

While LangChain now (as of version 0.3) recommends to use LangGraph, it is also mentioned that

"We do not plan on deprecating this functionality in the near future as it works for simple chat applications and any code that uses RunnableWithMessageHistory will continue to work as expected."