In OpenShift WebConsole, CrdbCluster Cluster creation UI does not have storage size field

In the CrdbCluster Creation UI, one cannot specify storage size in the UI. It requires one to modify the actual yaml file.

**Repro steps:**
- With Operator installed, attempt to create CrdbCluster
- On the "Create CrdbCluster" page, attempt to navigate to the "storage" field to specify size of pvc

**Expected Results:**
On expects to be able to set the storage field, like in the [example.yaml](https://github.com/cockroachdb/cockroach-operator/blob/master/examples/3-nodes-insecure.yaml#L27).

**Actual Results:**
It is not accesible on the Create CrdbCluster page. One can only access it through the Yaml editor.

This can be confusing for any user. One of our core user stories for the Operator is the ability to declaratively configure storage.