Use kapp config to orphan delete resources

[praveenrewar]

Describe the problem/challenge you have Currently if we want to remove resources from a kapp app, we have to either manually remove the kapp labels from the app or first add the orphan-delete strategy annotation to the resources and then delete them, thus requiring 2 deploys.

Describe the solution you'd like We would want a way to specify which resources to be orphan deleted using the kapp config. This would help us in removing resources from a app in one deploy command only.

Anything else you would like to add: This would be beneficial when a resource present in a package needs to be removed from the package (but not from the cluster) in a subsequent version of a package.

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[rohitagg2020]

Add an example so that it will be easy to triage when somebody picks it up