Emit events indicating total fees paid upon a packet relay in ics29

[colin-axner]

Summary

Using the event system, an external user should be able to determine the amount of fees paid via ics29. Add an event upon distribution of fees.

Problem Definition

We currently only emit total fees escrowed (which doesn't indicate total fees paid)

Proposal

Add a function EmitDistributeFeeEvent to events.go

Within distributeFeeOnAcknowledgement keep track of the total fees not refunded. Pass the total amount into EmitDistributeFeeEvent

Within distributeFeeOnTimeoutEvent, call EmitDistributeFeeEvent using the timeoutFee

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For Admin Use

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[colin-axner]

It's probably desirable to know which address is receiving the fee. Instead of batching up the total fees distributed, each time a non refund fee is distributed, emit a distribution event which includes the total amount and the address being distributed to

[crodriguezvega]

Background information shared by @adizere to inform priority:

it would be good if this can be done (not released, only drafted in a PR so we can use it in simd) as soon as possible -- if possible December or January, it would be amazing!
for context, we're doing a demo for relayer operators demonstrating the usefulness of fees, and this feature seems necessary we're still experimenting with things so we might have additional feedback by the way

[crodriguezvega]

It's probably desirable to know which address is receiving the fee. Instead of batching up the total fees distributed, each time a non refund fee is distributed, emit a distribution event which includes the total amount and the address being distributed to

Given this comment by @colin-axner I think the easiest will be to call EmitDistributeFeeEvent inside distributeFee in the case when the call to k.bankKeeper.SendCoinsFromModuleToAccount does not return an error.