Check for Google Topics API

[dmarti]

Additional item to test for: Google Chrome has an experimental user classification feature called "Topics API" which can be detected from JavaScript.

https://github.com/patcg-individual-drafts/topics#the-api-and-how-it-works

This is currently being deployed to a few percent of Google Chrome users, and not to those who have turned off third-party cookies.

"Topics API" is promoted as an advertising-related feature, but may end up being more commonly applied in personalized pricing and other areas.