Add adambkaplan as approver for core OCP repositories

adkaplan@redhat.com will be assuming the role of "Staff Engineer" for core OpenShift for the team, taking over the role from bparees@redhat.com. To expedite reviews and other OCP processes, Adam needs to be added back as an approver in the following repositories:

• openshift/source-to-image
• openshift/builder
• openshift/openshift-controller-manager
• openshift/cluster-openshift-controller-manager-operator

Adam may also need to be added to the OWNERS files in the following repos:

• openshift/enhancements
• openshift/api