usage of fee middleware

[crodriguezvega]

Explain for the different groups of users how to use fee middleware:

• For applications developers:
  • How to set up a middleware stack.
  • Show samples of how to integrate with:
    • transfers.
    • ICA. #1569
• For relayer operators:
  • How to register distribution address for every channel.
  • How to register counterparty address for every channel.
• For end users:,
  • How to incentivize own packet with the CLI.
• For chain teams:
  • Explain that if a module account is used to pay/receive fees it is recommended to to turn off invariants. And Document that the preferred flow would be using the fee grant module.

[damiannolan]

I'll start with the "For application developers" section

[seantking]

Picking up the For End Users section

will also pick up the For chain Teams section

[seantking]

@charleenfei do we need to add something about the fee grant module? We discussed this on a call but decided to leave it out for now as it doesn't seem related to ics29 (and more of an alternative option?).