Convert `resources` and `components` to be backed by a reusable generator

[KnVerey]

This is required for the Composition KEP, so that Compositions can use these key features.

Kustomize Plugin Composition API #2299

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/lifecycle stale

[KnVerey]

/remove-lifecycle stale

[natasha41575]

For anyone interested in working on this, there is a brief description of how our generators/transformers are implemented in this comment. #4671 (comment)

You can take the ConfigMapGenerator as an example. We want a plugin like that called ResourceGenerator, except instead of generating a ConfigMap, it should generate resources by reading from the resources field of the kustomization file.

Running make should automatically update our builtin plugins here and after that there will be some more work to hook up the resources field to invoke the new ResourceGenerator.

[k8s-triage-robot]

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• After 90d of inactivity, lifecycle/stale is applied
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/lifecycle stale