GetPrintColumns looks for the open API extension for the display columns.

NewOpenAPIData creates a new `Resources` out of the openapi document.

NewOpenAPIGetter returns an object to return OpenAPIDatas which reads from a server, and then stores in memory for subsequent invocations.

PrintColumnsKey is the key that defines which columns should be printed.

CachedOpenAPIGetter fetches the openapi schema once and then caches it in memory.

Resources interface describe a resources provider, that can give you resource based on group-version-kind.