Should punish and slash some from collateral if 1st and 2nd assigned relayers does not deliver in time in assigned time slot.

[hackfisher]

cc @fewensa

[hackfisher]

relayer1 | relayer2 | relayer3       (assigned)
  1          2        10

Settement rules update:

other_relayer relayed at slot (>3), slash(20% ~ 100%, 20% minimum) relayer1, relayer2, relayer3, no rewards

relayer3 relayed at slot(>=3), slash(20%) relayer1 and relayer2, no rewards

relayer2 relayed at slot(>=2), slash(20%) relayer1 and no rewards



20% slash from each collateral is the punishment for time slot expiry.


MessageOrder {
    assigned_relayers: AcountId[3],
    assigned_slots: BlockRange[3],   // [s1, s2), [s2, s3), [s3, s4), [s4, MAX)
    collaterals,
    price,
}