feat(forge): sanity checks before executing a script

Component

Forge

Describe the feature you would like

Do sanity checks before starting to send transactions for a forge script.

Additional context

• So many times i have entered the wrong Etherscan API key for whatever reason and had to either redeploy (if possible) or verify manually (sanity check would make sure my API key is valid)
• Same for gas estimation, i would set the --gas-estimate-multiplier to 200 or something -- script would start sending transactions and die in the middle (sanity check would make sure my account has enough ETH)

Im sure people would have other (better) ideas for more sanity checks. Either way that sort of feature would be a big UX improvement and could potentially save a lot of pain and resources for users.