v1alpha3: Extract CasC + Groovy Scripts to be managed by it's own CRs and Single Controller

[waveywaves]

Expected Behavior

CasC and Groovy Scripts should be defined using a different with their own CRs and reconciled by a single controller.
The CRs will be given jenkinsRef of reference to the Jenkins Instance which will then be used to create the CR in that particular instance.

Actual Behavior

They are a part of the Jenkins CR and reconciles after and before a few other reconcilation steps which shouldn't be the case.

[waveywaves]

cc @jkhelil

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. If this issue is still affecting you, just comment with any updates and we'll keep it open. Thank you for your contributions.