Add basic support for Dutch driving license (1-line MRZ fallback)

[staroselskii]

Summary

This PR adds initial support for parsing Dutch driving licenses with a single-line MRZ (e.g., D1NLD...). It introduces a lightweight fallback path in MRZCodeCreator that recognizes the format and extracts:

• Document number
• Birthdate
• Expiry date

The fallback matches strings starting with "D1NLD" and of 30 characters in length.

Why

The Dutch EU driving license MRZ does not follow ICAO TD1/TD2/TD3 standards and instead uses a 30-character one-line format. This MRZ is needed as a seed for NFC access (BAC key generation), and having this parsed correctly is a prerequisite for further feature development.

Limitations & Future Work

• This is a pragmatic and minimal addition focused on enabling functionality quickly.
• It does not attempt to generalize to all EU driving licenses or introduce a new MRZCode.Format case like .iso18013, although that may be worth exploring later.
• The parsing logic is embedded as a fallback inside MRZCodeCreator, but a more modular and extensible approach (e.g., a plugin system or format-aware parsing strategy) would be cleaner.
• I’m very new to Swift and iOS codebases, so some parts may not follow best architectural practices — feedback and guidance are very welcome.

Example

The following line will now return a valid MRZCode: D1NLD123456789001231250101ABCDE