feat: RO-crate packaging of workflow and metadata

**Is your feature request related to a problem? Please describe.**
Can we provide a way to store the ZARP workflow and its results together with the metadata of the corresponding run? 

**Describe the solution you'd like**
Check out the RO-Crate documentation https://www.researchobject.org/ro-crate/ to figure out whether we can use it for ZARP
