Improve Dynamic Gas Fees

[ljoss17]

Summary

The current version of Hermes, v1.8.2, is only compatible with Osmosis dynamic gas fees.
With Skip's FeeMarket https://github.com/skip-mev/feemarket the Hermes implementation needs to be more flexible.

Proposition

The current implementation uses a hardcoded endpoint, https://github.com/informalsystems/hermes/blob/v1.8.2/crates/relayer/src/chain/cosmos/eip_base_fee.rs#L18. This would need to be a configurable endpoint.

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