Add round and degreeOfCoherency info to the TokenAndETHShift event

[jaybuidl]

Blocking #264

Reposting from @alcercu's message on Slack

Problem

If in a dispute two jurors are penalized for being incoherent, both will get a 0 coherency score in the frontend, even if one were to have a higher degree of coherency than the other. In the end both were incoherent.

Solution

The best way to accomplish that would be to add a round field to the TokenAndETHShift . That will let me query the degree of coherency from the disputekit inside the subgraph (if we could add degreeOfCoherency to the event it would be event better, since querying contracts from the subgraph is quite slow, but I could manage without it, so not important). I think it will also give more context to this event, since there can be a lot of events from a single juror in a single disputes.