Add .graphql export

Closes #3443411

src/Commands/GraphqlExportCommands.php

@@ -49,6 +49,16 @@ class GraphqlExportCommands extends DrushCommands {
       }
 
       try {
+        if (!empty($setting['graphql'])) {
+          $data = $this->exportService->printSchema($server);
+          $filename = $this->writeFile($setting['graphql'], $data, $server->id() . '.graphql');
+
+          $this->logger()->success(dt('GraphQL Export: Exported schema @id (@filename)', [
+            '@id' => $server->id(),
+            '@filename' => $filename,
+          ]));
+        }
+
         if (!empty($setting['graphqls'])) {
           $data = $this->exportService->printSchema($server);
           $filename = $this->writeFile($setting['graphqls'], $data, $server->id() . '.graphqls');