A way to filter `RuleSet`s

[armanbilge]

An idea from Michael: .filter(_.id != "...")

This would make it easy to skip tests in certain situations e.g. typelevel/cats#4263

[armanbilge]

I gave this a try in 57b4acd but I'm not crazy about it. I feel like adding a checkFilter variant to checkAll in e.g. discipline-munit would be cleaner.

https://github.com/typelevel/discipline-munit/blob/0fa812cdee3d310a51906054bc56d3412e6c49cd/core/shared/src/main/scala/munit/DisciplineSuite.scala#L41-L43