Add BlockPeer interface to P2P

[shuse2]

Description

Add BlockPeer interface to P2P and replace the usage of p2p.ApplyPenalty(pid, p2p.MaxPenaltyScore) with `p2p.BlockPeer(pid)

Motivation

Simplify the usage of the applying penalty since from the other packages we mostly block the peer immediately

[shuse2]

This issue is actually invalid. it is valid that in the event handling, ApplyPenalty should not be used, and on request handling, it should be used. However, there are also requesting scenario which ApplyPenalty needs to be used. In this case, still Connenction.ApplyPenalty is required.

Therefore, it will not help much event if we add the ApplyPenalty to the ResponseWriter