feat: add exchange_to_ids to importable

lib/tallty_import_export/importable.rb

@@ -24,6 +24,10 @@ module TalltyImportExport
       def import_excel_klass
         import_instance.tallty_excel
       end
+
+      def exchange_to_ids xlsx_file, associations, **options
+        import_instance.exchange_to_ids(xlsx_file, associations, **options)
+      end
     end
   end
 end