[Enhancement] use NFD NodeFeature CR to advertise labels

[adrianchiris]

What would you like to be added?

Support a new Writer implementation that will write labels into a dedicated NodeFeatureRule CR per Node.

see[1].
We should also have a config knob to specify the writer to be used.

What is the use case for this feature / enhancement?

using a more k8s native approach to advertising vendor specific node features/labels via kubernetes custom resources in contrast to filesystem based method as done today.

[1] https://kubernetes-sigs.github.io/node-feature-discovery/v0.13/usage/customization-guide.html#nodefeature-custom-resource