Add JandexClassMetadataScanner as a replacement for slow reflection scanning

[spbolton]

Overview

Introduce Jandex class metadata scanning capabilities to dotCMS core to improve reflection-based operations and enable more efficient class discovery and analysis. This has been pulled out from work required for #32656 so it can be generally used.

Background

dotCMS currently relies on traditional Java reflection for class metadata operations, which can be slow and resource-intensive. Jandex provides a more efficient approach by pre-indexing class metadata at build time, enabling faster runtime operations.

Benefits

• Performance: Faster class discovery and metadata retrieval
• Build-time Analysis: Pre-computed class indexes reduce runtime overhead
• Enhanced Capabilities: Better support for annotation scanning and class hierarchy analysis
• Foundation for Future Features: Enables advanced features like dependency injection improvements and plugin system enhancements

Acceptance Criteria

• Implement JandexClassMetadataScanner utility class
• Add Jandex dependency to core module
• Create comprehensive documentation for usage patterns
• Add unit tests for JandexClassMetadataScanner functionality
• Provide integration examples for common use cases
• Ensure backward compatibility with existing reflection-based code

Technical Requirements

• JandexClassMetadataScanner should provide:
  • Class discovery by package
  • Annotation-based class filtering
  • Metadata extraction capabilities
  • Integration with existing dotCMS patterns
• Documentation should cover:
  • Usage patterns and best practices
  • Integration examples
  • Performance considerations
  • Migration guidance from traditional reflection

Implementation Notes

• This is a foundational capability that will be used by multiple parts of the system
• Should be treated as core infrastructure component
• Design for extensibility to support future enhancements

[spbolton]

This issue is being addressed in PR #32869

[github-actions]

PRs linked to this issue

• chore(backend): Add JandexClassMetadataScanner as a replacement fo (#32868) by @spbolton