Create plan for upgrade CRD versions

[secondsun]

Long term, we will have multiple versions of CRDs and the operator will need to be able to upgrade them. This process is described in this document : https://docs.openshift.com/container-platform/4.6/operators/operator_sdk/osdk-generating-csvs.html#olm-dependency-resolution-crd-upgrades_osdk-generating-csvs

[secondsun]

Likely this will be a co-requisite with #98

[secondsun]

@wtrocki will talk with openshift console team for how they will handle multiple versions of CRs/CRDs

[wtrocki]

Version change requires patching kubernetes. Frequent version changes are not advised :D

[secondsun]

As long as we don't have breaking changes and only add fields, we can delay this.