jsonschema should re-export referencing::Error

[mplanchard]

Resource is re-exported in jsonschema, but in order to create one, one has to call Resource::from_content(), which returns a Result<Resource, referencing::Error>. It is impossible to access referencing::Error in any way that I can see form the jsonschema crate, so it becomes necessary to import referencing as well, ensuring version and type parity.

It would be much more convenient if either all of referencing were re-exported somewhere, or at least some referencing namespace was provided in which the Error could be accessed.

[Stranger6667]

Makes sense, that's an oversight. Thank you so much for reporting it