Use 'metadata.labels' as Tags for all controllers

[max-rocket-internet]

Is your feature request related to a problem?

We write an abstraction for ACK resources and I'm looking for an easy and consistent way of specifying and testing tags for ACK resources.

The current process for adding tags to resources is quite mixed. So far I've found 4 different approaches:

1. spec.tags is []*Tag: most common across all controllers, e.g. SNS
2. spec.tags is []*Tag but different: The key/value names are different for KMS
3. spec.tags is map[string]*string: for SQS controller
4. spec.tagging.tagSet is []*Tag: for S3 controller

Describe the solution you'd like

Can we just copy GCP Config Connector?

Labels in the metadata field of a Config Connector resource are also added to the associated Google Cloud resource.

It would be super convenient and nice if labels from the ACK custom resource are just copied from metadata.labels to the cloud resource that is created by the ACK controller.

Describe alternatives you've considered

Currently we just deal with the inconsistency in our abstraction layer but it feels messy.