Peering - compare incoming connection

[macfarla]

PR description

extracted from #6968

• only disconnect "worst" peer if we have max peers.
• on incoming connection, compare the incoming peer to the current collection of peers and (if at max peers) disconnect whichever compares least favourably - in effect this will be the incoming peer if all our current peers are giving us good responses (reputation score), or it will be an existing peer if any are not giving good responses

example debug log (yes there is a TODO to remove this log)

{"@timestamp":"2024-04-19T00:53:31,297","level":"DEBUG","thread":"nioEventLoopGroup-3-9","class":"EthPeers","message":"comparing worstCurrentPeer PeerId: 0x024e106a70572288... PeerReputation score: 87, timeouts: {3=5}, useless: 0, validated? true, disconnected? false, client: erigon/v2.58.2-125509e4/linux-amd64/go1.21.8, [Connection with hashCode 1276176835 inboundInitiated? true initAt 1713481827797], enode://024e106a70572288701e97724610d120a682f69f24881eeee0ab1f6379646780d93daf11d9226593faf71deb699f24020dbecf801eb3d0da779ef2be641590fa@3.38.172.157:30304 with connectingPeer PeerId: 0x1ec3a5e247e616a3... PeerReputation score: 100, timeouts: {}, useless: 0, validated? true, disconnected? false, client: Nethermind/v1.25.4+20b10b35/linux-x64/dotnet8.0.2, [Connection with hashCode 1951644955 inboundInitiated? false initAt 1713488011205], enode://1ec3a5e247e616a347038b9c35a1328529bdf354408fe3c968433df542eb1b2a7c7d1b7b7d481a5b6465baac64877ee53e1396ddf43a3ad0f5f0adbaed659145@188.40.67.160:30303","throwable":""}

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