interface: add more stagedUpdateRun additionalPrintColumns

[jwtty]

Description of your changes

Add additionalPrinterColumns for clusterStagedUpdateRun and clusterApprovalRequest objects.
Update the examples to use the v1beta1 APIs.

The get command outputs now look like:

kubectl get clusterstagedupdaterun
NAME          PLACEMENT           RESOURCESNAPSHOT               POLICYSNAPSHOT        INITIALIZED   SUCCEEDED   AGE
example-run   example-placement   example-placement-0-snapshot   example-placement-7   True          True        13m

kubectl get clsuterstagedupdaterun -owide
NAME          PLACEMENT           RESOURCESNAPSHOT               STRATEGY           POLICYSNAPSHOT        INITIALIZED   SUCCEEDED   AGE
example-run   example-placement   example-placement-0-snapshot   example-strategy   example-placement-7   True          True        3m47s

kubectl get clusterapprovalrequests
NAME                     UPDATERUN     STAGE        APPROVED   AGE
example-run-canary       example-run   canary       True       12m
example-run-production   example-run   production   True       11m

Fixes #

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Special notes for your reviewer

[zhiying-lin]

have a question about this field.

we want an index or a name? from the example you provided, it's a name.

The resources could be divided to multiple snapshots.

[zhiying-lin]

ditto, name or index?

i remember policySnapshot won't be divided to multiple ones.

[zhiying-lin]

Use the "-" to split the words?