Add zenpower rapl source

[CkovMk]

Add zenpower as an more accurate power source for AMD Zen-based CPU.

Currently in draft

[CkovMk]

Fixed ci lint issue. Having tested this on 3 of Zen-based PCs with 5950X, 5750G and 9700X, all works.

[amanusk]

Thanks for opening the PR
From what I understand, this requires installing a kernel module to access the metrics.
Do you know if there are plans to bake it in, so it is available out of the box?
I'm a bit hesitant about adding reads that require external kernel modules.
Yes, this can be very useful and informative

[CkovMk]

From what I understand, this requires installing a kernel module to access the metrics.
Yes.

Do you know if there are plans to bake it in, so it is available out of the box?

I'm happy to help, but I'm new to this project. Could you shed some light on how a custom kernel module could be added in your preferred way?

I'm thinking of pull the kmod repo, build and install it in setup.py. But this seems unconventional...

Also, do you want this kernel module to be built unconditionally or just with supported AMD CPUs?