SafeAPI ability to query contracts

[stwiname]

Save api needs the ability to query contracts at a certain height.

[guplersaxanoid]

which CosmWasmClient method do you suggest that we override? I don't see anything that allows querying contract by height. I only see querying by code ID and contract addresses https://github.com/cosmos/cosmjs/blob/main/packages/cosmwasm-stargate/src/cosmwasmclient.ts