Normalize decimal separators

[doneill]

Summary

Handle comma decimal separators in JSON Schema number fields

Fixes

#17

Proposed changes

1. Utility Function (normalizeDecimalSeparators):
   • Converts comma decimal separators to periods (e.g., "12,99" → "12.99")
   • Handles negative numbers ("-15,75" → "-15.75")
   • Safely ignores non-numeric strings, numbers, and complex formats
   • Uses strict regex pattern (/^-?\d+,\d+$/) to only convert simple decimal commas
2. Integration (normalizeNumberFields):
   - Automatically processes all number fields in schema during validation
   - Normalizes default, minimum, and maximum values
   - Uses traverseSchema to handle nested objects
3. Validation Pipeline:
   - Integrated into validateJSONSchema before other validation steps
   - Preserves all existing functionality

Test

• Run all the tests yarn test
• Make sure all tests pass