Add CRD upgrader job for the cass-operator Helm charts

[burmanm]

What is missing? Currently, cass-operator Helm charts behave the "Helm way", which is that once CRDs have been installed, they're not upgraded by Helm. User must manually do that part of the process.

This breaks certain upgrades in cass-operator, where the new CRD is actually required (cass-operator will not function correctly with older CRDs).

We could add this behind a property, such as upgradeCRDs like cert-manager does and that way allow user to define if they want us to handle the CRD upgrade or not.

Why do we need it?

Environment

• Cass Operator version:

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┆Issue is synchronized with this Jira Story by Unito ┆Issue Number: CASS-32