feat(config): deny resources by using RESTMapper as an interceptor
This approach ensures that resources in the deny list are **always**
processed regardless of the implementation.
The RESTMapper takes care of verifying that the requested Group Version Kind
complies with the deny list while checking for the REST endpoint.
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feat(config): provide a limited clientset which check access
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review: addressed PR comments
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feat(config): provide a limited metrics clientset to check access
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review: addressed PR comments regarding pods_exec
