feat: Add complete Apache Iceberg integration with AWS Glue Catalog s…

[JohnChe88]

…upport

• Add comprehensive Iceberg functions library (libs/glue_functions/iceberg_glue_functions.py)
• Implement production-ready Lambda handlers for Iceberg table operations
• Add time travel queries and metadata access capabilities
• Include advanced features: schema evolution, table history, snapshots
• Provide complete ETL pipeline with data quality checks
• Add CloudFormation infrastructure templates for AWS deployment
• Include comprehensive usage examples and documentation
• Support for reading Iceberg tables from AWS Glue Catalog
• Full S3 integration with proper AWS credentials handling
• Production deployment scripts and cleanup utilities

Key Features:

• Read Iceberg tables with time travel support
• Query table metadata (history, snapshots, schema)
• Complete Spark session configuration for Lambda
• Error handling and comprehensive logging
• Multiple Lambda handler templates for different use cases
• Infrastructure as Code with CloudFormation
• End-to-end testing and validation scripts

Issue #, if available:

Description of changes:

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