feat(medusa): workflow engine api (#6330)

What:

   Workflow Engine API.
   Endpoints for:
     - List workflow executions
     - Run a workflow
     - Set async steps as success or failure
     - Retrieve the details of a workflow run

integration-tests/api/medusa-config.js

@@ -25,5 +25,6 @@ module.exports = {
       resolve: "@medusajs/cache-inmemory",
       options: { ttl: cacheTTL },
     },
+    workflows: true,
   },
 }

integration-tests/api/package.json

@@ -12,6 +12,7 @@
     "@medusajs/cache-inmemory": "workspace:*",
     "@medusajs/event-bus-local": "workspace:*",
     "@medusajs/medusa": "workspace:*",
+    "@medusajs/workflow-engine-inmemory": "workspace:*",
     "faker": "^5.5.3",
     "medusa-interfaces": "workspace:*",
     "pg": "^8.11.0",