docs: Add a simple lifecycle hooks example for Python

[MuhammadHamidRaza]

This pull request adds a simple and easy-to-understand code example for Agent lifecycle hooks to the Python documentation.

I noticed that while the example folder does contain examples, they are often more complex and might be difficult for a beginner to grasp. My goal with this PR is to provide a very small, direct, and user-friendly example that shows only the core functionality of AgentHooks.

This example is intentionally minimal and focuses on demonstrating how to:

• Define a custom AgentHooks class.
• Use the hooks parameter in the Agent definition.

This will make the feature much more accessible to new users, helping them quickly understand and implement lifecycle events without being overwhelmed by a more comprehensive example.

[seratch]

Thanks for sending this. However, we generally recommend checking examples.