feat: titleCase util

[pi0]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation, readme, or JSdoc annotations)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This adds a new titleCase utility.

I have reused the trainCase type utils extended to support joiner but the types are not accurate (and traincase types are also seem not working properly)

For runtime impl I have essentially duplicated logic because this allows to independently improve them both without adding more complexity.

I also used a compact regex that handles very common exceptions that need to be lowercased. A compromise that is not perfect but better than random inline - to replaces we use everywhere to have title-case-like output.

ideas welcome to improve 👍🏼

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.