Add LangGraph integration with AgentOps

[Dwij1704]

📥 Pull Request

📘 Description

• Created comprehensive documentation for LangGraph integration, including installation, setup, and usage examples.
• Developed a LangGraph example notebook demonstrating agent workflows with tool usage.
• Implemented a simple LangGraph example to showcase basic functionality without tools.
• Enhanced the agent node to support tool invocation and improved error handling in calculations.
• Established a structured graph workflow with conditional routing for agent and tool nodes.
• Added detailed logging and tracing capabilities to monitor execution flow in the AgentOps dashboard.

🧪 Testing
Run examples

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Works