Add estimated Gas used in the return type of simulateContract

[hskang9]

https://viem.sh/docs/contract/simulateContract.html#return-value

Having an estimate of how much gas is going to be used is helpful for end users to measure the network cost. I urge the dev to add estimated gas fees on simulating the contract.

[hskang9]

https://viem.sh/docs/ethers-migration#viem-18

This does not work. Viem client does not have function estimateContractGas