[Feature Suggestion] Show cost of deployment in Eth

[srinjoyc]

Problem

Currently, when you run cargo stylus deploy --estimate-gas --private-key $PVT_KEY, the last log shows deploy gas estimate: 30989288 gas. While this is useful, the user would have to take additional steps and time to know if they have sufficient funds for deployment / get the actual cost of deployment.

Proposed Solution

It would be very convenient to have this displayed alongside an estimated_gas_fee (similar to how Metamask shows you the fee costs directly when estimating gas). If there was some additional log output that could fetch the current gas price and display an estimated amount in ETH, it makes it easy for the user to determine if they would like to deploy under current network conditions.

Benefits

Saves the user some steps/time, gives them confidence in the costs, and prevents users from having a poor experience if there is a spike in gas prices prior to deployment which may result in failed deployments, lost fees, etc.