`Collector` type Group resource

[SteveL-MSFT]

Summary of the new feature / enhancement

I thought I had opened a similar issue, but couldn't find it. The idea is that similar to the Assertion resource, this Collector resource always performs an export. The information returned would be used via reference() for other resources for other types of operations. Like a set might want to give all users read access to something, so the Collector would enumerate the users which would be used later as the value of a set.

Proposed technical implementation details (optional)

No response