Add metrics for BBR extension

[rramkumar1]

Ref: #439

[k8s-ci-robot]

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[rramkumar1]

/hold

Need to squash commits

[rramkumar1]

/assign @robscott

[rramkumar1]

/unhold

[ahg-g]

/ok-to-test

[JeffLuoo]

Can you also update https://github.com/kubernetes-sigs/gateway-api-inference-extension/tree/main/site-src/guides to include BBR metrics?

[rramkumar1]

Can you also update https://github.com/kubernetes-sigs/gateway-api-inference-extension/tree/main/site-src/guides to include BBR metrics?

I can take it on in a follow-up PR if that's okay. I suspect there will be some back and forth on how we want to structure the README in terms of adding BBR metrics.

[ahg-g]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahg-g, rramkumar1

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[robscott]

Thanks @rramkumar1!

/lgtm