feat: support other coin decimals, e.g. Ethermint (backport #866)

[mergify]

This is an automatic backport of pull request #866 done by Mergify.
Cherry-pick of a033ba4 has failed:

On branch mergify/bp/v7/pr-866
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Changes to be committed:
	modified:   chain/cosmos/chain_node.go
	modified:   chainspec.go
	modified:   conformance/test.go
	modified:   examples/cosmos/chain_miscellaneous_test.go
	modified:   examples/cosmos/chain_param_change_test.go
	new file:   examples/cosmos/ethermint_test.go
	modified:   examples/ibc/learn_ibc_test.go
	modified:   examples/ibc/wasm/wasm_ibc_test.go
	modified:   examples/ibc/wasm/wasm_icq_test.go
	modified:   examples/polkadot/polkadot_chain_test.go
	modified:   examples/polkadot/push_wasm_client_code_test.go
	modified:   ibc/types.go
	modified:   interchain_test.go
	modified:   test_user.go

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	both modified:   chain/cosmos/cosmos_chain.go
	both modified:   examples/cosmos/chain_upgrade_ibc_test.go
	deleted by us:   examples/cosmwasm/rust-optimizer/rust_optimizer_test.go
	deleted by us:   examples/cosmwasm/workspace-optimizer/workspace_optimizer_test.go
	both modified:   examples/hyperspace/hyperspace_test.go
	both modified:   examples/penumbra/penumbra_chain_test.go
	both modified:   go.sum
	both modified:   go.work.sum

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[Reecepbcups]

hmm, as I am seeing it to integrate into dymension: ethermint is still on SDK v46 so it's not liking the IBC go v7 requirements of the new cosmossdk.io in 47+

[Reecepbcups]

My branch: https://github.com/Reecepbcups/dymension_interchaintest/tree/reece/ictest