Emit close channel event when a timeout occurs on an ordered channel

[colin-axner]

Summary

we should emit a channel closed event when a timeout occurs for an ordered channel

---

For Admin Use

• Not duplicate issue
• Appropriate labels applied
• Appropriate contributors tagged/assigned

[crodriguezvega]

• Add new event type EventTypeChannelClosed here.
• Emit event after this line within the if block.

ctx.EventManager().EmitEvents(sdk.Events{
	sdk.NewEvent(
		types.EventTypeChannelClosed,
		sdk.NewAttribute(types.AttributeKeyPortID, portID),
		sdk.NewAttribute(types.AttributeKeyChannelID, channelID),
		sdk.NewAttribute(types.AttributeCounterpartyPortID, channel.Counterparty.PortId),
		sdk.NewAttribute(types.AttributeCounterpartyChannelID, channel.Counterparty.ChannelId),
		sdk.NewAttribute(types.AttributeKeyConnectionID, channel.ConnectionHops[0]),
                sdk.NewAttribute(types.AttributeKeyChannelOrdering, channel.Ordering.String()),
	),
	sdk.NewEvent(
		sdk.EventTypeMessage,
		sdk.NewAttribute(sdk.AttributeKeyModule, types.AttributeValueCategory),
	),
})

[colin-axner]

LGTM

I think this part:

sdk.NewEvent(
		sdk.EventTypeMessage,
		sdk.NewAttribute(sdk.AttributeKeyModule, types.AttributeValueCategory),
	),

is probably not needed.

The event should also have a function in 04-channel/keeper/events.go -> EmitChannelClosedEvent

I would do the event emission after we call EmitTimeoutPacketEvent