refactor(agents-md): split agents md helpers

[Peterl561]

📝 Description

Refactored agents-md helper functions to multiple files
Added some basic tests for the helper functions

✅ Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (improve a current implementation without adding a new feature or fixing a bug)
• Improvement (non-breaking change which improves an existing feature)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update