Resource property 'part-of-stack'

**Is your feature request related to a problem? Please describe.**
No

**Describe the solution you'd like**
It would be great to see, for each Azure resource, if it is part of a stack.

Let's assume that over time many users will migrate to stacks for a strong grouping of resources, tracking ownership, and grouping resources for application (components). Now, many teams will likely use updateBehavior=detach as no one accidentally wants to remove something that is still (unknowingly) in use. This behavior would lead to many resources that are no longer part of any stack, most likely because they can be removed.

Having clear visibility into resources that are (no longer) part of a stack can be a great way for tracking no longer used resources.