Support query-extension queries

[Clark Tomlinson]

Summary 💡

I would love to be able to use our queries from https://github.com/tjefferson08/query-extensions
specifically screen.getBySelector()

Motivation 🔦

more over supporting other custom queries somehow would be really amazing if possible.

[Stephan Meijer]

Thanks for the suggestion. At this moment, "query-extensions" is not something I'd like to support in testing-playground.

Regarding the getBySelector, it sounds to me that container.querySelector is the same?