p2p: PeerTracker. rework scoring system

[vgonkivs]

Currently, the score is calculated as an average value between the current request and the previous average value. I believe we can do better. For example, here they are using EVMA.

TLDR:
This is a way of calculating the average value where previous values have a lower weight on some alpha(from 0.1 to 1) than a new one.

We should also consider this approach and try to test it.