Provide info on experiment/project metric storage usage in the web UI

[ColeMilesKodiak]

Proposal Summary

In the web UI, provide info on metric storage usage both at a project level as well as an individual experiment level. It is currently impossible to figure out what experiments are responsible for using up metric storage.

Motivation

When reaching metric storage limits, it's not clear which projects are using the most storage and should be prioritized for cleaning up. When developing new debug metric plots, it's not clear how much storage is going to be used up by its use.

[ainoam]

Thanks for suggesting @ColeMilesKodiak.

This is indeed on our roadmap, albeit not a near term item.

[d13g0]

This would be very useful! +1 👍🏼