[PWGLF,Tutorial] Add CollisionCutsGroup utility class with automatic configurable registration

[BongHwi]

Summary

This PR introduces a new CollisionCutsGroup class that follows the v0SelectionGroup pattern to enable automatic configurable registration of collision event selection parameters in O2 analysis tasks.

Key Changes

• New utility class: CollisionCutsGroup that auto-registers all collision selection parameters via ROOT serialization
• Automatic event selection import: Includes all event selection flags from EventSelectionParams.h using macro-based generation
• Reduced boilerplate: Eliminates ~25 lines of manual configurable declarations per task
• Comprehensive documentation: Added tutorial task and README with usage examples

Files Added:

• PWGLF/Utils/collisionCutsGroup.h - Main class definition
• PWGLF/Utils/collisionCutsGroup.cxx - Implementation with ROOT dictionary
• PWGLF/Utils/collisionCutsGroupLinkDef.h - ROOT dictionary linkage
• PWGLF/Utils/EventSelectionFlagsMapping.def - Event selection flag mappings
• Tutorials/PWGLF/Utils/collisionCuts.cxx - Tutorial task demonstrating usage
• Tutorials/PWGLF/Utils/README.md - Comprehensive documentation

Files Modified:

• PWGLF/Utils/collisionCuts.h - Refactored to support the new group pattern
• PWGLF/Utils/CMakeLists.txt - Added library build for collisionCutsGroup
• Tutorials/PWGLF/CMakeLists.txt - Registered new Utils tutorial subdirectory

[github-actions]

O2 linter results: ❌ 0 errors, ⚠️ 0 warnings, 🔕 2 disabled

[BongHwi]

Ready to merge now. Please review it when you're free.