Extension request: LightStep

Created by: felixfbecker

As a user, I would like to see decorations for code that starts spans like this:

Hovering them should show an embedded diagram of for that span, like the embedded view for traces.

Note: Embedded views are only supported for streams (aka saved searches). It would be great if they were supported for any search (e.g. just passing the operation name) and showed the latency histogram we see on live search pages.