Feature/ph license plate recognizer

[jacobArquiza]

Change Description

Add a new predefined recognizer for Philippine vehicle license plate numbers (PH_LICENSE_PLATE).

Supported formats:

• Modern private plates: ABC 1234 (3 letters + 4 digits, LTO standard since 2013)
• Motorcycle plates: 1234 ABC (4 digits + 3 letters)
• Legacy private plates: AB 1234 (2 letters + 4 digits, pre-2013)
• Conduction stickers: C12D345 (alphanumeric, issued before official plates)

Space, dash, or no separator accepted for all formats. Context words include both English (plate, lto, registration) and Tagalog (plaka, kotse, motorsiklo). Case-sensitive matching enforced via custom global_regex_flags. Includes validate_result() to reject hex colors, all-digit, and all-letter false positives. Disabled by default (enabled: false) consistent with other country-specific recognizers.

Issue reference

Fixes #2015

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

[jacobArquiza]

@microsoft-github-policy-service agree