Merge pull request #13485 from dmk1111/master

chore(list): add missing export

Author: kdinev

projects/igniteui-angular/src/lib/list/public_api.ts

@@ -4,6 +4,7 @@ import { IgxListActionDirective, IgxListComponent, IgxListLineDirective, IgxList
 
 export * from './list.component';
 export {
+    IgxListBaseDirective,
     IgxListPanState,
     IgxEmptyListTemplateDirective,
     IgxDataLoadingTemplateDirective,