CreateSafePrepareTransactionRequestParams can't be used on chain where a multisig owns the contracts #222
Description
I've noticed that the example script to setup fast withdrawal was written the assumption that the private key of the chain owner is available.
On prod chains, it's usually a good practice to change ownership to a multisig after deployment.
The createSafePrepareTransactionRequest function which is used to prepare the safe creation transaction requires a Viem PrivateKeyAccount to be passed. This seems unnecessary and could be replaced with 0x${string}.
Ideally the same change would be applied on all functions needed to setup fast withdrawals, allowing these transactions calldata to be easily generated using the SDK and then signed by a multisig.