Implementation to add data to info and stats page (Generic way not tied to Chrome)

[brandonlo11]

I am trying to display data in tabs that is not part of the data rendered in tracks. The only ways I've found to do that is to render an event in a track to be able to display the data in tabs or to use ChromeMetaData packets. (This issue was brought up to lalitm on discord)

[LalitMaganti]

I've scoped out how to do this and I have a plan: will send a CL soon.

[LalitMaganti]

@primiano and I chatted: we've agreed that we need to not just solve this issue but also add a bunch of protos to add slices, counters, stack traces and trace metadata in a much simpler way than track_event and much more efficient way than JSON. We're going to be looking into designing this in the coming months.