feat(`forge script`): enable outputting of raw unsigned transactions

[jbrower95]

Component

Forge

Describe the feature you would like

• Is there a way to get forge script to output just the raw unsigned transactions (as opposed to signed transactions)?
• Ideally during a vm.startBroadcast() i'd like to be able to see the transactions you're signing, and maybe mock the from: address, but not broadcast anything to network.
• This is to decouple signing from our scripts, as certain strategies for signing / submitting transactions require breaking out of foundry. For example, I need to write a forge script whose transactions are encoded and submitted to a multisig -- I don't want the signed transaction, only the raw calldata.

Additional context

No response