New serverless pattern - eventbridge-scheduled-stepfunction-bedrock-kb-sync

[shansv]

Issue #, if available:

Description of changes:
Added a new serverless pattern that demonstrates automated synchronization of Amazon Bedrock Knowledge Bases using EventBridge Scheduler and Step Functions.

Key components and changes include:

Architecture Components:
    EventBridge Scheduler (15-minute intervals)
    Step Functions with nested Map states
    S3 bucket for data sources
    Bedrock Knowledge Base integration

Implementation Details:
    Created CDK stack for infrastructure deployment
    Implemented Step Functions workflow with:
        Outer Map state for multiple Knowledge Bases
        Inner Map state for data source handling
        Status checking and result reporting
    Added necessary IAM roles and permissions

Features:
    Automated scheduling of Knowledge Base syncs
    Support for multiple Knowledge Bases
    Sequential processing of data sources (due to current Bedrock limitations)
    Comprehensive error handling and status reporting
    Future-proofed design for parallel processing

Documentation:
    Added README with deployment instructions
    Included testing procedures
    Documented architecture and workflow
    Added cleanup instructions

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