fix(pascalCase, camelCase): lower rest of each segment

[pi0]

🔗 Linked issue

Resolves #53

❓ 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

For PascalCase and camelCase (which depends in Pascal util), we were splitting but then preserving cases of each segment which could be upper or lower.

Before: FOO_BAR => pascal: FOOBAR camel: fOOBAR
After: FOO_BAR => pascal: FooBar camel: fooBar

This has small regression but i think right fix for the utils.

Note: This new behavior be behind a flag in next patch releases ~> #63

📝 Checklist

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