Send and event once an external resource is created and ready to use

[malachiobadeyi]

We provide a platform built on git-ops principles which allow developers to build and deploy to Kubernetes as well as create and configure external resources outside of the cluster. Crossplane plays a big part in that, however, one of the problems we have, is that Crossplane does not send a notification when an external resource such as RDS is actually created and ready for use. At the moment it just sends an event saying "Successfully requested creation of external resource". The resource can then take 10 - 20 minutes to actually become ready. In an ideal world, crossplane would emit an event when the resource is ready and we would then send a notification to our user. Because of this gap, we have had to create our own custom controller to watch the status of crossplane objects and create our own events when a resource is created and ready for use.
Can you add a feature to send events when a resource is created and ready for use.

[negz]

It seems reasonable to send a Kubernetes event when a resource is ready. I'll see if anyone has bandwidth to take a look at your PR. Thanks!

[github-actions]

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