Add CSV export for lists and domain blocks (#9677)

Fix #6893
Fix #9268

app/controllers/settings/exports/lists_controller.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+module Settings
+  module Exports
+    class ListsController < ApplicationController
+      include ExportControllerConcern
+
+      def index
+        send_export_file
+      end
+
+      private
+
+      def export_data
+        @export.to_lists_csv
+      end
+    end
+  end
+end