feat: add flatCase and trainCase

[itpropro]

Added utils and tests for Train-Case (HTTP-Header-Case) and flatcase

❓ 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

Added utils and tests for Train-Case (HTTP-Header-Case) and flatcase

📝 Checklist

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8ded420) 100.00% compared to head (2535ce0) 100.00%.
Report is 3 commits behind head on main.

Additional details and impacted files

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  Coverage   100.00%   100.00%           
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  Files            2         2           
  Lines          295       340   +45     
  Branches        34        39    +5     
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+ Hits           295       340   +45     

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[danielroe]

Lovely 👌

[pi0]

Nice additions ❤️ Apart from comments, i think from list found, we might support FOO_BAR and FOO-BAR like cases to complete the collection of all casing utils 🔥