WIP: New split lib workflow

We need to:
- [ ] check that meta-analysis is still working
- [ ] finish preprocessing (split libs) connect per prep template
- [ ] make preprocessing async
- [ ] be able to connect to other studies raw data
- [ ] fix metadata summary per prep template
- [ ] add EBI submission
Right, and so we go back to the first comment which was very easy to suggest: follow the guidelines that we set forth to follow, and which are in place in the entire codebase...