Feature/add spark data lakehouse

[Ishani-10]

feat: Add Spark + Iceberg playground example

Complete Spark integration with Jupyter notebook for data analysis. Includes full Docker Compose setup, configuration management, and comprehensive documentation.

Key Features:

• Spark + Iceberg REST Catalog integration
• Interactive Jupyter notebook interface
• MySQL to Iceberg data pipeline
• Production-ready configuration

[sandipkumardey]

Hi @Ishani-10, can you please fix the PR title (use type(scope): description) and update the documentation link, or mark it as N/A and update the PR.