Add GPU usage history

[rpensek]

Is your feature request related to a problem? Please describe.
Although RAM and CPU usage is very low my MBP still gets very loud now and then. I need to open Activity monitor and check GPU history (under Window menu item) and kill rogue Chrome tab or App that uses too much of it. Having a dedicated GPU usage widget (for each or combined graphic cards) would be awesome!

Describe the solution you'd like
Basically I'd love to have the GPU usage history in Activity Monitor -> Window -> GPU History as a widget in iGlance, like we have for CPU usage. It would be great to have separate ones (dedicated and integrated) as well as combined - whichever it's using.

Describe alternatives you've considered
Activity Monitor -> Window -> GPU History

Additional context

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[D0miH]

Hey @rpensek,
this is definitely a feature I would love to integrate. However, at the moment I am not sure how we could read the GPU processor usage either for the integratel intel or the dedicated GPU. I think I will have to research a bit how we could read those values.