Investigate on ICS29 fee middleware

[thomas-nguy]

In order to bring cosmos tokens to cronos, we need a fee mechanism to cover the cost of maintaining relayers

ICS29 fee middleware in ibc-go seems still WIP, but worth to have a look and experiment

https://github.com/cosmos/ibc-go/tree/ics29-fee-middleware

[adu-web3]

I can work on investigating the ICS29 and how could I experiment with this? @thomas-nguy