Add 'name' property to model revision

Model revisions are currently identified by a UUID. For the sake of good UX, we want to also assign a user-friendly name to each model revision, and allow the users to customize it.

Task:
- Extend the model revision entities with a string attribute `name` (non-optional)
- In the seeding script, assign a user-friendly name to the model, e.g. "YOLO-X demo model"