Metadata not allowed on Range (and other classes)

[LvanWissen]

Expected behaviour:

According to the Presentation 3 specs, it is allowed to have a metadata key on a Range object. See: https://iiif.io/api/presentation/3.0/#a-summary-of-property-requirements

Observed behaviour:

When trying to add metadata to a Range, the Pydantic validation returns:

File "pydantic/main.py", line 363, in pydantic.main.BaseModel.__setattr__
ValueError: "Range" object has no field "metadata"

Potential bug location(s):

Adding metadata: Optional[Metadata] = None to the Range class in skeleton.py would fix this.

iiif-prezi3/iiif_prezi3/skeleton.py

Line 388 in 7c64e36

class Range(Class):

Any other comments:

I guess this then should also apply to Annotation, AnnotationPage, AnnotationCollection and what the spec calls 'Content Resources'? And for the other properties described in the spec table.