Jackson 3 support (via optional dependencies)

[kasmarian]

Description

Motivation and Context

Add support for Jackson 3 as part of the migration to Spring Boot 4.

This change makes Jackson 3 as the primary JSON parsing library. Compatibility with Jackson2 is preserved for a smooth transition.

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [ ] All commits are signed