Detect via ChangeTracker if a modified CollectionEntry was added or removed

[mrlife]

This is fairly straightforward to do for non-collection properties (see #9237 (comment)).

For a CollectionEntry, it looks like the IsModified is set to true correctly when an item is added or removed from a collection, however there doesn't seem to be a way to tell if it was added or removed, only that something changed.

I've looked through the docs, including here and here, and through issues, including #9312 and #10093 but haven't found a solution. Is this currently possible? If not, is there any plan to do so?