Add checks to skip relaying cleared packet for all stages of relaying #539
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This PR introduces a
SkipClearedPacketpacket relayer middleware that checks whether a given packet has been cleared on the source chain, before proceeding to relay a given packet.A packet is considered cleared on the source chain, an ack or timeout has already been relayed, and that the source chain has cleared its original packet commitment. In that case, the relayer do not need to perform anything else and can return early.
This is mainly useful when the event-based relayer is used for packet clearing. In such case, the relayer would be given old chain events, and it needs to determine whether the packet has already previously been cleared, so that it does not repeat any relaying that has already been done before.