Create NEG metrics collector interface

[sawsa307]

Create NEG metrics collector that would periodically emit NEG syncer metrics.

[k8s-ci-robot]

Hi @sawsa307. Thanks for your PR.

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[sawsa307]

/assign @swetharepakula

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: sawsa307
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[bowei]

/ok-to-test