feat: Add support for scheduled workflows (#7651)

We still need to:
But wanted to open the PR for early feedback on the approach

packages/modules/workflow-engine-redis/integration-tests/__fixtures__/workflow_scheduled.ts

@@ -0,0 +1,23 @@
+import { SchedulerOptions } from "@medusajs/orchestration"
+import {
+  createStep,
+  createWorkflow,
+  StepResponse,
+} from "@medusajs/workflows-sdk"
+
+export const createScheduled = (name: string, schedule?: SchedulerOptions) => {
+  const workflowScheduledStepInvoke = jest.fn((input, context) => {
+    return new StepResponse({})
+  })
+
+  const step = createStep("step_1", workflowScheduledStepInvoke)
+
+  createWorkflow(
+    { name, schedule: schedule ?? "* * * * * *" },
+    function (input) {
+      return step(input)
+    }
+  )
+
+  return workflowScheduledStepInvoke
+}