support querying ics27 host chain execution message events via cli

[colin-axner]

Summary

Understanding the result of message execution on the host chain can be difficult as currently implemented. We should add cli tools which make it easy to get the events from message execution on the host chain

Problem Definition

The controller will not get back any useful information from the channel acknowledgement. Thus one needs to query the events via the MsgRecvPacket hash.

Proposal

Add a cli command which takes in a channel id, and a sequence. It should query recv packet events on the channel id (using interchain accounts as the port id) for the specified sequence. These events should be returned.

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[damiannolan]

In order to query events via the MsgRecvPacket hash, we need to be able to reproduce this hash, right?
We can use this func from x/auth/tx to pull the events from the TxResponse

func QueryTx(clientCtx client.Context, hashHexStr string) (*sdk.TxResponse, error)

What I am missing is how can we reproduce a MsgRecvPacket hash with a port id, channel id, sequence? Do we not need all the parts that make up the msg (packet, proofCommitment, proofHeight, signer)? We can retrieve the acknowledgement hash but I don't think that's very valuable in order to get at events.

I would imagine there is a more flexible way to query events. SDK docs are a little bare wrt. to this, and don't really provide any indication of what APIs can be used to pull the data other than a persisted websocket conn which is just the direct tendermint connection.

[colin-axner]

Can we use QueryTxsByEvents? We should only get 1 tx back if we query for the ica event associated with a specific packet exection