Docs: Add partially generated metrics reference

[hjet]

This adds a reference doc for metrics exposed by this component. Mostly generated using tooling from k/k.

I can check in the scripts if necessary but it's a bit hacky -- modified the tools here and essentially use this file as a lookup table for the scraped metrics. This is because the static analysis tool does not identify metrics defined in dependencies (most of the metrics exposed by the custom metrics adapter).

Closes #134

[linux-foundation-easycla]

• ✅login: hjet / (af1bdd0)

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[logicalhan]

/assign @dgrisonnet
/triage accepted

[dgrisonnet]

Awesome! Thank you for looking into this @hjet

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dgrisonnet, hjet

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[dgrisonnet]

Thought I tagged it, my bad

/lgtm

[dgrisonnet]

/ok-to-test

[hjet]

Thanks!