Add ban peer functionality

[dapplion]

It would be nice that the app layer can communicate discv5 to consider some peers for some time. Check Lighthouse as impl reference

https://github.com/sigp/lighthouse/blob/e4b62139d7e2d5b0499648663af8de25b368f0bd/beacon_node/eth2_libp2p/src/discovery/mod.rs#L492