Add nano-string-utils to Generic Utilities

[Zheruel]

Summary

This PR adds nano-string-utils to the Generic Utilities section.

Library Details

• Name: nano-string-utils
• Size: < 8.5KB minified + gzipped
• Features: 48 tree-shakable string utilities including:
  • Case conversion (camelCase, kebabCase, snakeCase, etc.)
  • String validation (email, URL, etc.)
  • Template interpolation
  • Fuzzy matching and text search
• Dependencies: Zero
• Tree-shakeable: Yes
• TypeScript: Fully typed

Verification

• ✅ Size is under 2KB per function
• ✅ Tree-shakeable with modular exports
• ✅ Useful client-side
• ✅ Meets popularity criteria (100+ stars or 500+ weekly npm installs)
• ✅ Contains JavaScript code

The library provides focused string utilities that complement existing generic utility libraries in this list.