DRA: add admin controlled device attributes + device taints

These are two different KEPs that provide two features that can be enabled and
disabled independently. However, both use the same new ResourceSliceOverride
type and thus get described and implemented together.

Author: pohly

keps/prod-readiness/sig-node/5027.yaml

@@ -0,0 +1,6 @@
+# The KEP must have an approver from the
+# "prod-readiness-approvers" group
+# of http://git.k8s.io/enhancements/OWNERS_ALIASES
+kep-number: 5027
+alpha:
+  approver: "@johnbelamaric"