✨ update the --namespace <namespace> option to accept a comma-separated list for watching multiple selected namespaces

[marek-veber]

What this PR does / why we need it:

• watching multiple selected namespaces

Which issue(s) this PR fixes
Fixes #11192

/area/clusterresourceset

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[sbueringer]

/hold
As we don't have consensus on the linked issue yet (which is also why we didn't add triage/accepted)

[fabriziopandini]

+1 to what @sbueringer said
we should not add flags until we have a clear idea of what we want to achieve.
also, as written in a few comments, this is not as simple as adding a flag.