Add list views that can filter objects based on dynamic type

[dimitar-asenov]

We need a class that behaves similarly to the current List family, but is able to provide a view of itself that looks like a list but is limited to only some elements from the list. For example it will be better to have a single list of Declaration objects in Class which can be viewed for convenience as a list of methods or a list of inner classes, etc. Such a view should still allow iteration, modification and reads.