support namespaceselectors for cluster propagation policies

[grosser]

What type of PR is this?

/kind feature

What this PR does / why we need it:

we want to match a clusterpropagationpolicy to resources in only some namespaces

Special notes for your reviewer:
POC, need comments on if this makes sense and ideas on how to get the namespace object

Does this PR introduce a user-facing change?:

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[XiShanYongYe-Chang]

For users, this increases the flexibility of pp use, but increases the complexity of pp and provides the complexity of the system. Can we consider extending a layer above pp and leaving clear resource descriptions to pp?

[XiShanYongYe-Chang]

/cc @RainbowMango

[grosser]

afaik this only makes sense for cpps, but since they share the resource selector with pp I opted to not duplicate everything