Initialize metrics collector

[sawsa307]

Initialize NEG metrics collector in controller. Define export duration in flags.

[sawsa307]

/assign @swetharepakula

[k8s-ci-robot]

Hi @sawsa307. Thanks for your PR.

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[bowei]

/ok-to-test

[swetharepakula]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sawsa307, swetharepakula

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