Add OADP (Velero) Operator (#18)

Commits:
- Operator: openshift/oadp-operator@a924ad9
- Velero: openshift/velero@9ac863a
- Velero Plugin: openshift/openshift-velero-plugin@dcc8f21
- Velero Plugin for CSI: openshift/velero-plugin-for-csi@428ab3d
- Velero Plugin for KubeVirt: kubevirt/kubevirt-velero-plugin@a8423da
- Velero Plugin for GCP: openshift/velero-plugin-for-gcp@a33bd7a
- Velero Restic Restore Helper: openshift/velero@9ac863a
- Velero Plugin for Azure: openshift/velero-plugin-for-microsoft-azure@3e4b507
- Velero Plugin for AWS: openshift/velero-plugin-for-aws@54113b1