Fix Langchain

[Dwij1704]

Closes #2424 #2429

• Updated langchain dependency to version 1.0.0 or higher.
• Introduced langchain-classic for legacy support.
• Enhanced README with compatibility information and installation instructions for both LangChain 1.x and LangChain Classic.
• Updated example code to reflect new agent framework usage.
• Added _is_json_parseable helper with optimizes approach
• Handled RemoveMessage from langchain_core

[github-actions]

CLA Assistant Lite bot:
Thank you for your submission, we really appreciate it. Like many open-source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution. You can sign the CLA by just posting a Pull Request Comment same as the below format.

---

I have read the CLA Document and I hereby sign the CLA

---

_{You can retrigger this bot by commenting recheck in this Pull Request}