Add anonymizer property to IpAddress model

[oschwald]

Expose the GeoIP2 Insights anonymizer data in the minFraud IpAddress
model. This was previously available in the underlying GeoIP2 library
(since 3.3.0) but not exposed in minFraud responses.

Co-Authored-By: Claude Opus 4.5 noreply@anthropic.com

[gemini-code-assist]

Summary of Changes

Hello @oschwald, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request integrates and exposes previously unavailable anonymizer data from GeoIP2 Insights within the minFraud IpAddress model. This enhancement provides more detailed information about the anonymity status of IP addresses, improving the comprehensiveness of minFraud responses for users.

Highlights

• Anonymizer Property Addition: The anonymizer property has been added to the MaxMind\MinFraud\Model\IpAddress class.
• Data Exposure: This new property exposes GeoIP2 Insights anonymizer data, including VPN detection confidence, provider name, and network last seen date, which was previously available in the GeoIP2 library but not in minFraud responses.

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[gemini-code-assist]

Code Review

This pull request correctly exposes the anonymizer data from the underlying GeoIP2 library in the minFraud IpAddress model. The changes are well-implemented, including updates to the model, serialization logic, and test data. I've added one suggestion to improve the test coverage for the new anonymizer object to ensure all its properties are correctly mapped and validated.