add openrdf rdfxml dependency to allow interacting with viaf rdf data [#39084091]
remove unused/redundant imports
add methods to get rdf graph for a single viaf resource, check if graph includes an owl:sameAs rel for a uri [#39084091]
add dbpedia -> viaf lookup when dbpedia record does not include viaf id [#39084091]
use dbpedia short-form id instead of full uri for ead authfilenumber
rdf record fixture for testing ViafResource rdf detail / sameas methods