[Backport 7.58.x] envoy: add support for tls_inspector metrics #18553
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Backport f768b9e from #18536.
What does this PR do?
add support for tls_inspector metrics
see also
https://www.envoyproxy.io/docs/envoy/latest/configuration/listeners/listener_filters/tls_inspector
Motivation
Additional Notes
Review checklist (to be filled by reviewers)
qa/skip-qa
label if the PR doesn't need to be tested during QA.backport/<branch-name>
label to the PR and it will automatically open a backport PR once this one is merged