Add support to sched_overutilized plotting
Created by: derkling
This series adds an initial support to parse the sched_overutilized event which is used to report EAS entering/exiting from overutilized mode.
The sched_overutilzied event is used to build "ESA-mode" intervals which are conveniently overdrawn to some plots thus marking when events are happening in EAS or non-EAS mode.