misc(p2p/peerTracker): peerTracker improvement

[vgonkivs]

Last week we discussed with @Wondertan ways to improve the peer tracker:

• fix(p2p/session): return peer to the queue in case of ErrNotFound #159 introduces adding peers who are currently syncing back to the queue to request them one more time. We should add a backoff for these peers;
• move scoring to the Connection Manager under a specific tag;
• remove limiting for 100 tracked peers in the peer tracker;
• check peer support for the protocol. We should migrate from Connect event to Identify.

[Wondertan]

To finish off this, we would need to add test that ensures we can get valid headers from a single honest peers, when other hundred is malicious.

[vgonkivs]

Agree. This test case will be added in scope of the pr