Analyze extension methods

[LinqLover]

Is your feature request related to a problem? Please describe.
At the moment, the only way to analyze extension methods is to find the package of their containing class and have it analyzed separately.

Describe the solution you'd like
It would be nice to have an item "extension methods" in the class list per class that contains all values from PackageInfo >> #extensionMethodsForClass:.

Open questions
How to deal with class tests?

[LinqLover]

PS: Analogously, extension methods from another package should not be checked.