refactor(server): reorganize server configs (#5753)

packages/backend/server/src/plugins/config.ts

@@ -1,3 +1,4 @@
+import { GCloudConfig } from './gcloud/config';
 import { PaymentConfig } from './payment';
 import { RedisOptions } from './redis';
 
@@ -5,6 +6,7 @@ declare module '../fundamentals/config' {
   interface PluginsConfig {
     readonly payment: PaymentConfig;
     readonly redis: RedisOptions;
+    readonly gcloud: GCloudConfig;
   }
 
   export type AvailablePlugins = keyof PluginsConfig;