Clean java.util.Stream from stack traces

There are a number of `Stream` related stack frames that could probably be collapsed, in particular I'm thinking of `java.util.stream.AbstractPipeline`, `java.util.stream.ReferencePipeline` and `java.util.stream.ForEachOps`.

Even if that isn't acceptable for general use, with JUnit 5 there a good 60 frames at the bottom of every stack where it just bounces back and forth between collapsed "Testing framework" frames and "Stream" frames (with a few `[Spl]iterator.forEachRemaining` sprinkled in), it would be nice if all those created a single "Testing framework" collapsed frame.