Add various RDF unit tests

[jviotti]

Signed-off-by: Juan Cruz Viotti [email protected]

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🤖 Augment PR Summary

Summary: This PR expands the schema test suite to validate RDF/JSON-LD output in addition to JSON Schema validity.

Changes:

• Added `rdf` expected outputs for several RFC 7946 GeoJSON fixtures (FeatureCollection, Feature, GeometryCollection, Point, LineString, Polygon, and multi-* geometries).
• Added `rdf` expectations for IETF identifier schemas (URI/IRI) and selected ISO code lists (country, currency, language).
• Introduced explicit empty `rdf: []` assertions for cases where the schema intentionally mints no identifier (e.g., WebDAV HTTP methods, newer HTTP status codes, and certain UTR units).
• Added RDF expectations for selected XBRL UTR unit-to-IRI mappings (QUDT and SI Digital Framework IRIs).

Technical Notes: RDF expectations are represented as expanded JSON-LD node objects using @id, @type, and list containers via @list (including @json typed literals where appropriate).

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