Richer prom metrics

[kfswain]

What would you like to be added: We would like richer, unaggregated inferencePool metrics to allow the user to perform their own aggregations

Why is this needed: the necessity is discussed here https://github.com/kubernetes-sigs/gateway-api-inference-extension/pull/304/files#r1947016924

[kfswain]

/assign @JeffLuoo

[k8s-ci-robot]

@kfswain: GitHub didn't allow me to assign the following users: JeffLuoo.

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/assign @JeffLuoo

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[kfswain]

@JeffLuoo if you dont mind saying hello here, we can get this assigned to ya

[JeffLuoo]

Can you provide some examples of what metrics we want to aggregate on inferencePool level? Do you have any proposal for it I can review? Thanks.

[kfswain]

This issue was created from a PR of yours, at your request, the comment should have all the context

[JeffLuoo]

I see, thanks. cc: @raywainman @smarterclayton

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