fix: block sync hangs on initial node start

[rodrigo-o]

Motivation

This PR tries to fix the hanging that happens often in Sepolia, specially at the first Sync.

Description

The issue was related to peer scoring/penalizing, right now we had a naive implementation where penalization immediatly removed a peer. I made some small changes to have a better scenario, specially on Sepolia where this issue happen the most. Ultimately what made the node hang was getting out of peers and ending in a sleep cycle that never released LibP2P to handle incoming new peers. The points tackled are:

• Add a couple of seconds more before the sync starts
• Implement a really simple penalizing algorithm that just decrease the score of a peer every time it's penalized
• Implement a naive scoring algorithm that takes of a small pool of good-scored peers

This PR is enough for most situations, it will be rare to end up with an empty peerbook, and in case it happens we'll see an error quickly, failing instead of leaving us waiting. There are some follow-ups but are lower in priority than for example #1309:

• I created Block & Blob Downloaders need manage the empty peerbook async #1317 for tackling the root cause of this issue in depth, we need to give LibP2P control again instead of sleeping and make sure that getting a peer is handled properly.
• We need to keep an eye at the current poor-man's peer scoring implementation

Resolves #1308

[rodrigo-o]

We can do something similar to the peer selection in the pruning and just prune the lower score ones but is probably something to tackle in a PR that focus on the peer-scoring algorithm.

[Arkenan]

LGTM.