Cannot serialize Scipp objects

[damskii9992]

Our automatic serializer currently cannot serialize Scipp objects.

When calling getfullargspec from the inspect module to introspect a scipp class's constructor arguments, the following error is thrown:

Similarly, when using the more modern inspection method signature of the inspect module, the following error is thrown:

We rely on introspection to define how the dictionaries should be created, and as such the to_dict method fails when one of the arguments needs to be a scipp class.

[damskii9992]

This is apparently only an issue with the lower-level classes like sc.Variable, since this is not a class which should be constructed directly, instead you're supposed to construct it with its constructor classes, like sc.Scalar or sc.array.

Scipp does have it's own to_dict and from_dict methods, so the most sensible solution is to simply automatically use those methods whenever available:

https://scipp.github.io/generated/modules/scipp.compat.dict.to_dict.html#scipp.compat.dict.to_dict