feat: Expose Vert.x metrics

[purplefox]

Description

This PR exposes a bunch of Vert.x metrics including HTTP stats.

Testing done

Manually tested using jconsole.

Reviewer checklist

• Ensure docs are updated if necessary. (eg. if a user visible feature is being added or changed).
• Ensure relevant issues are linked (description should include text like "Fixes #")

[vcrfxia]

LGTM! Would be great to add something about these new metrics into our docs. AFAIC all we've got currently on JMX is https://docs.ksqldb.io/en/latest/operate-and-deploy/#monitoring-and-metrics which looks rather out of date. Perhaps @JimGalasyn can comment on the best way / place to add docs.

I also ran the set of endpoints we're collecting metrics for by @rodesai so we're good to merge.

[apurvam]

Should we merge this, since we are looking to cut a release soon.

[purplefox]

Thought I merged this already! Clearly not ;)

Regarding docs - I think we can handle this external to this PR.