feat: Add UK passport and vehicle registration recognizers

[tee-jagz]

Add two new UK-specific recognizers:

• UK_PASSPORT: detects 2-letter + 7-digit passport numbers (2015+ format)
• UK_VEHICLE_REGISTRATION: detects current (2001+), prefix (1983-2001), and suffix (1963-1983) number plate formats with age identifier validation

Change Description

• Add UkPassportRecognizer for UK passport numbers (2-letter prefix + 7 digits, issued from 2015 onwards) with context-based scoring
• Add UkVehicleRegistrationRecognizer for UK number plates covering three format eras, with validate_result checking age identifier ranges (02-29, 51-79) for the current format and replacement_pairs for space/hyphen normalization
• Both recognizers are disabled by default in default_recognizers.yaml (country-specific convention)
• 13 test cases for passport, 27 test cases for vehicle registration

Issue reference

N/A

Checklist

• I have reviewed the contribution guidelines
• I have signed the CLA (if required)
• My code includes unit tests
• All unit tests and lint checks pass locally
• My PR contains documentation updates / additions if required