Observe data from resources created by Release object

[migueladh]

What problem are you facing?

Releases generate objects that have useful data once them are created.
If we want to use that data in a composition there's currently no way of doing so.

How could Crossplane help solve your problem?

Provide a way to define properties in release object (i.e. ExternalObservations) to declare what data to extract for generated resources and add them to a key in status.atProvider

If feature seems interesting, I'll be more than happy of providing a PR with one approach to do it :)