Adding metrics related to ICS29 fees

[ljoss17]

Summary

Retrieve data on ICS29 fees which have been distributed.

Note that this work, which depends on Tendermint multi-version support, is currently branched off of the mikhail/multi-version-tendermint branch. The last thing to do will be to merge the metrics into main once multi-version support has been merged into Hermes.

Problem Definition

At Hermes v1.1 in order to have an idea of how much fees have been paid to relayers via ICS29, a user would need to query the balances and compute the difference while taking into account the gas paid.

Proposal

When events with fee distribution information will be emitted, cosmos/ibc-go#2847, Hermes should retrieve and display this information (e.g. adding new metrics).

Acceptance Criteria

• Hermes displays useful metrics regarding fees distributed via ICS29
• Merge into main once the mikhail/multi-version-tendermint branch is merged

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[adizere]

We'll test with cosmos/ibc-go#2975