Add uid as label to service metrics

[jhorwit2]

What would you like to be added:

Add UID as a label, like it is on some other metrics, to all service metrics.

Why is this needed:

This is valuable since load balancer services in clouds often use the UID as the name of the cloud load balancer; however, there's no easy way then to join those metrics in say grafana given the uid is not available by kube state. Making UID available as a field would make this possible

Describe the solution you'd like

Additional context

[liangyuanpeng]

/assign