Add L4 NetLB Dual-Stack Metrics

[panslava]

This PR adds counting service per ipFamilies, ipFamilyPolicy and Status for L4 NetLB DualStack

As ILB and NetLB DualStack metrics store the same data, I changed type L4ILBDualStackServiceState to be just general L4DualStackServiceState

I will add PersistentError (status to report after 20 mins of errors) in the next PR for both ILB and NetLB

[cezarygerard]

/retest

[k8s-ci-robot]

@panslava: GitHub didn't allow me to assign the following users: czawadka.

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/assign czawadka

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[panslava]

/assign @cezarygerard

[panslava]

/assign aojea

[cezarygerard]

we discussed it at te desk
good job Slavik!

[cezarygerard]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cezarygerard, panslava

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