feat(types,modules-sdk): basic module setup for promotions (#5920)

RESOLVES CORE-1580

packages/promotion/integration-tests/utils/config.ts

@@ -0,0 +1,6 @@
+import { ModuleServiceInitializeOptions } from "@medusajs/types"
+
+export const databaseOptions: ModuleServiceInitializeOptions["database"] = {
+  schema: "public",
+  clientUrl: "medusa-promotion-test",
+}