ChannelUpgradeCancel defines a rpc handler method for MsgChannelUpgradeCancel.

ErrorReceipt defines a type which encapsulates the upgrade sequence and error associated with the upgrade handshake failure. When a channel upgrade handshake is aborted both chains are expected to increment to the next sequence.

Normally the RevisionHeight is incremented at each height while keeping RevisionNumber the same. However some consensus algorithms may choose to reset the height in certain conditions e.g. hard forks, state-machine breaking changes In these cases, the RevisionNumber is incremented so that height continues to be monitonically increasing even as the RevisionHeight gets reset