[EPIC] Organize AURA using a mono-repo
Maintaining a lot of services with several repos keeps creating a lot of overhead.
A mono-repo can e.g. help with:
- coordination issues: multiple people have to work in sync
- general maintainability: refactoring can be reviewed more easily in one place
- interfaces: APIs can be updated all at once
But there are also workflow, structural and tooling consequences we need to be aware of.