[DevTools] Add a little bar indicating time span of an async entry relative to others #34016
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I shrank the width to have more space for the title: 
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eps1lon
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Stacked on #34016. This is using the same thing we already do for the performance track to provide a description of the I/O based on the content of the resolved Promise. E.g. a Response's URL. <img width="375" height="388" alt="Screenshot 2025-07-28 at 1 09 49 AM" src="https://github.com/user-attachments/assets/f3fdc40f-4e21-4e83-b49e-21c7ec975137" />
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Stacked on #34012.
This shows a time track for when some I/O started and when it finished relative to other I/O in the same component (or later in the same suspense boundary).
This is not meant to be a precise visualization since the data might be misleading if you're running this in dev which has other perf characteristics anyway. It's just meant to be a general way to orient yourself in the data.
We can also highlight rejected promises here.
The color scheme is the same as Chrome's current Performance Track colors to add continuity but those could change.