Set required recorded field on Provenance resource

The FHIR R4 Provenance resource requires the recorded field (1..1
cardinality). This was missing, making the generated Provenance
resources technically invalid.

Author: trobanga

src/main/java/de/medizininformatikinitiative/torch/model/management/ResourceBundle.java

@@ -265,6 +265,7 @@ public Bundle toFhirBundle(String extractionId) {
     private static Provenance createProvenance(String extractionId, String groupId, List<ResourceGroup> groupResources) {
         Provenance provenance = new Provenance();
         provenance.setId(PROVENANCE_PREFIX + groupId);
+        provenance.setRecorded(new Date());
 
         // Add all resources under the same group as targets
         groupResources.forEach(rg ->