support visualizing trace metrics

[Vadman97]

Summary

Shows trace metric event keys as graphable keys in the metrics UI.
This will allow creating a web vitals dashboard.

How did you test this change?

Are there any deployment considerations?

when we extract metrics into their own product in the future, we should
refactor to remove some of this logic.

Does this work require review from our design team?

no

[linear]

HIG-4611 allow visualizing trace metric events

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Latest commit: ac4f696

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[Vadman97]

@mayberryzane updated per your feedback!