dry-run mode for sncast transactions

[amanusk]

Which component is your feature related to?

Cast

Feature Request

When creating a complex transaction, with invoke declare or deploy, it is sometimes useful to see the details of the transaction as "dry-run", before actually invoking it onchain. This can help validate that parameters were set correctly, such as fees, account used, etc.
This can also call and estimateFee endpoint to get a quote for the actually costs of the transactions, and gauge whether it will fail or not