feat(workflows-sdk,orchestration): async step as background task (#6886)

packages/workflow-engine-inmemory/integration-tests/__fixtures__/index.ts

@@ -1,4 +1,5 @@
 export * from "./workflow_1"
 export * from "./workflow_2"
+export * from "./workflow_async"
 export * from "./workflow_step_timeout"
 export * from "./workflow_transaction_timeout"

packages/workflow-engine-inmemory/integration-tests/__fixtures__/workflow_async.ts

@@ -0,0 +1,29 @@
+import {
+  StepResponse,
+  createStep,
+  createWorkflow,
+} from "@medusajs/workflows-sdk"
+import { setTimeout } from "timers/promises"
+
+const step_1_background = createStep(
+  {
+    name: "step_1_background",
+    async: true,
+  },
+  jest.fn(async (input) => {
+    await setTimeout(200)
+
+    return new StepResponse(input)
+  })
+)
+
+createWorkflow(
+  {
+    name: "workflow_async_background",
+  },
+  function (input) {
+    const resp = step_1_background(input)
+
+    return resp
+  }
+)