make models generic

src/lib/src/main/java/gov/usgs/earthquake/nshmp/netcdf/www/Metadata.java

 package gov.usgs.earthquake.nshmp.netcdf.www;
 
-import java.util.List;
-
 import gov.usgs.earthquake.nshmp.gmm.NehrpSiteClass;
-import gov.usgs.earthquake.nshmp.netcdf.www.NetcdfService.SourceModel;
 import gov.usgs.earthquake.nshmp.netcdf.www.Request.RequestData;
 import gov.usgs.earthquake.nshmp.netcdf.www.Request.RequestDataSiteClass;
 import gov.usgs.earthquake.nshmp.netcdf.www.meta.DoubleParameter;
@@ -15,13 +12,13 @@ import io.micronaut.http.HttpRequest;
  *
  * @author U.S. Geological Survey
  */
-public class Metadata<T extends Query> {
+public class Metadata<S, T extends Query> {
   public final String description;
   public final String[] syntax;
-  public final List<SourceModel> models;
+  public final S models;
   public final DoubleParameter vs30;
 
-  Metadata(HttpRequest<?> request, NetcdfService<T> netcdfService, String description) {
+  Metadata(HttpRequest<?> request, NetcdfService<S, T> netcdfService, String description) {
     var url = request.getUri().toString();
     url = url.endsWith("/") ? url.substring(0, url.length() - 1) : url;
     this.description = description;