Extend `ack-generate` to generate an extra comment marker for an `AGE` column

[a-hilaly]

Is your feature request related to a problem?
When i execute a kubectl get on an ACK CRD I don't see the age of the resource.

k get tables
NAME   STATUS   TABLE
tbb    ACTIVE   tbb

Describe the solution you'd like
As a kubernetes user i would like to see the age of the resource at the last column e.g:

k get tables
NAME   STATUS   TABLE  AGE
tbb    ACTIVE   tbb   283d

[a-hilaly]

It looks like the solution is pretty straightforward, we need to append //+kubebuilder:printcolumn:name="Age",type="date",JSONPath=".metadata.creationTimestamp" to the list of printcolumn comment markers

Another solution would be to add the comment directly in the CRD type templates and shield it with a boolean config