This should enable a user to:

• Upload an RO-Crate containing a 5S-TES message.
• The RO-Crate metadata is sent to the Crate Validation Service to be validated
• After validation the 5S-TES message is passed to the wizard for submission

We can discard the rest of the RO-Crate for now (if this isn't obvious and easy to work out where to store it).