Add `lowest_block_number` as a field in `PeerData` among peers

[alessandromazza98]

One piece of data that might be cool to collect is the lowest block number among eth peers that have the latest forkid and a few blocks near the tip.

Why?

These data could help to understand how many nodes are pruned and how many are archive.

[Rjected]

^ noting that "pruned" here means block-level pruning, which prunes more information than reth does right now