Release of the request start time metrics

I was wondering when the latest update related to the request start time, — i.e. https://github.com/flashbots/mev-boost/pull/647, — is expected to be released?

This update is supposed to facilitate the measurement of latency between the validator and the relay, which, depending on the case, is quite crucial.

Thank you in advance for any insights.

CC: @avalonche , @jtraglia

Start with the request-start-time update referenced in PR #647 and check whether it has been included in a published release. Done means providing the release status or expected release information in this issue; no source files or tests are identified in the issue.

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