RDFLib / rdflib / 31470258617

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fix: do not split XML namespace URIs into invalid qnames (#3500)

The built-in xml namespace (http://www.w3.org/XML/1998/namespace) has no
trailing delimiter, but split_uri() unconditionally split any URI starting
with it. A URI such as http://www.w3.org/XML/1998/namespace/ was therefore
split into the local name "/" and serialized as "xml:/", which is not a
valid qname and fails to parse back.

The XML namespace shortcut now applies only when the remainder is empty or a
valid NCName; otherwise the URI falls through to the generic splitting logic
and is serialized as a full IRI, so it round-trips.

Closes #3490

Co-authored-by: Nicholas Car <nick@kurrawong.net>

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