Added getter for authorized party field (azp)

src/main/java/org/gcube/oidc/rest/JWTToken.java

@@ -75,6 +75,10 @@ public class JWTToken implements Serializable {
         return payload;
     }
 
+    public String getAzp() {
+        return (String) getPayload().get("azp");
+    }
+
     public Long getExp() {
         return (Long) getPayload().get("exp");
     }