add support for "metadata" api resources

[ublubu]

[wlan0]

@ublubu can you document what's done and what's missing from this list?

[ublubu]

admissionregistration.v1alpha1

• ExternalAdmissionHookConfiguration
• InitializerConfiguration

apps.v1beta2

• ControllerRevision

apiextensions.v1beta1

• CustomResourceDefinition

autoscaling.v1

• HorizontalPodAutoscaler

core.v1

• Event
• LimitRange
• PodTemplate

policy.v1beta1

• PodDisruptionBudget

scheduling.v1alpha1

• PriorityClass

settings.v1alpha1

• PodPreset

extensions.v1beta1

• PodSecurityPolicy