`x/dynamicfee`: prepare relayer code

[tbruyelle]

Relayer like Hermes have specific code for the dynamic fee system module, in order to fetch the expected fees :

https://github.com/informalsystems/hermes/blob/fc8376ba98e4b595e446b366b736a0c046d6026a/crates/relayer/src/chain/cosmos/eip_base_fee.rs#L24-L36

Currently Hermes supports the Gaia feemarket module, but for AtomOne we need to update the proto path of the query.

Check also if other relayers needs to be changed.

[tbruyelle]

Must be done after the rename #169

[tbruyelle]

done informalsystems/hermes#4403