NewPluginInitializer constructs new instance of PluginInitializer TODO: switch these parameters to use the builder pattern or just make them all public, this construction method is pointless boilerplate.

PluginInitializer is used for initialization of the Kubernetes specific admission plugins.

WantsCloudConfig defines a function which sets CloudConfig for admission plugins that need it.

WantsQuotaConfiguration defines a function which sets quota configuration for admission plugins that need it.

WantsRESTMapper defines a function which sets RESTMapper for admission plugins that need it.