One-line enhancement description (can be used as a release note):
Kustomize File Processing Integration
Kubernetes Enhancement Proposal:
This is a follow up to [KEP Kustomize Subcommand Integration](kustomize-subcommand-integration.md)
[Kustomize](https://github.com/kubernetes-sigs/kustomize) was introduced as
subcommand of kubectl to allow users to build their kustomizations directly.
However users need to pipe the kustomize output to other commands in order
to use the kustomizations.
This KEP proposes integrating the kustomization libraries into the cli-runtime
file processing libraries. Doing so will provide a cleaner, simpler UX
and provide a path for addressing issues around error handling and messaging.
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