Handle ImOnline Offences

changed milestone to %ğtest migration

added P5-sometimesoon label

changed milestone to %ğdev currency launch

changed milestone to %ğtest migration

We need to fok and reimplement pallet_offences for our own needs.

A first behavior to implement: when we recieve an offence with kind im-online:offlin, if the proportion oh offenders is large enough, auto trigger goOfffline for the concerned validator.

mentioned in issue #94 (closed)

added ET-weeks Mandatory-prod labels

assigned to @bgallois

closed