Add component metrics to /metrics endpoint

[mattdurham]

PR Description

Add support for passing prometheus register to components and wrapping them with the component id. I used component_id since I thought id might be used elsewhere since it is so generic. Adds ready endpoint that is triggered from the initial load/reload.

Which issue(s) this PR fixes

Closes #1938

Notes to the Reviewer

PR Checklist

• Tests updated

[marctc]

I was wondering if instead to have an specific metric per component we could have generic metrics (accessed, errors, etc) with a label as component name. That would give us the ability to easily add metrics to new components without having to create new metrics per component, like in this ongoing PR

[mattdurham]

There is probably room for some generic cases: errors springs to mind. Could be once we have a stable of components see which ones have high commonality.

[rfratto]

🎉 Nice!

I tested it out with a few reloads after removing / adding components and everything looks clean.