Separate shared CRDs like AdoptedResource into a stand-alone chart

[michaelvl]

Helm charts for the individual controllers include CRDs for resources managed by the specific controller and additionally each controller includes the common CRDs AdoptedResource and FieldExport. This is problematic from a GitOps 'ownership' point of view. It also means that managing and versioning these CRDs follow the controllers.

It would be a better separation of concerns if these CRDs were managed as a separate chart and each controller only contained the CRDs for the specific controller. This is similar to how e.g. Istio have a base chart that installs CRDs and other charts for e.g. the Istio controlplane.