Add UUIDs to SDFG elements

[phschaad]

No description provided.

[tbennun]

The diff looks good, the error is weird (because super().__init__() is called). I would refactor the uuid function to a central location so that it is configurable (e.g., for determinism).

[phschaad]

I tried debugging the error a bit and I am genuinely super confused what is going on here. It doesn't even matter what I name the property, it really is like it is never defined for some instances of objects, but it is for others - despite super().__init__() seemingly being called everywhere, as you state.

[phschaad]

It's __deepcopy__...

[tbennun]

@phschaad so we already have a validation check that tests the uniqueness of id(obj) for objects for bad references. I wonder if we should also verify that for obj.id (probably secondary)

[tbennun]

LGTM, great addition!