[Improvement] Exclude IEnumerator members from CodeLens

[RaZeR-RBI]

Issue description

Seems to be an issue similar to #4245.

In short, when you try to implement a custom enumerator it tries to count all references to MoveNext/Current/Reset and hangs.

I've made a workaround for myself using the #4418 but I think it's probably useful to include these symbols in exclude list by default, MoveNext being the bare minimum IMO (because Current/Reset could clash with code not related to enumeration).

What do you think?

[JoeRobich]

@RaZeR-RBI I think we would want to wait until we get more feedback that these symbol names are problematic. Our current recommendation would be to make use of the symbol filter for names that are an issue in your solution.