feat(medusa, utils): Allow object feature flags (#4701)

Feature flags can be set as follows:

**Environment variables**
```
MEDUSA_FF_ANALYTICS=true
MEDUSA_FF_WORKFLOWS=createProducts,addShippingMethods
```

**Project config**
```
{
  featureFlags: {
    analytics: true,
    workflows: {
      createProducts: true,
      addShippingMethods: true,
    }
  }
}
```

integration-tests/plugins/__tests__/product/admin/index.ts

@@ -6,9 +6,10 @@ import { initDb, useDb } from "../../../../environment-helpers/use-db"
 import adminSeeder from "../../../../helpers/admin-seeder"
 import productSeeder from "../../../../helpers/product-seeder"
 
-import { simpleSalesChannelFactory } from "../../../../factories"
-import { AxiosInstance } from "axios"
 import { Modules, ModulesDefinition } from "@medusajs/modules-sdk"
+import { Workflows } from "@medusajs/workflows"
+import { AxiosInstance } from "axios"
+import { simpleSalesChannelFactory } from "../../../../factories"
 
 jest.setTimeout(5000000)
 
@@ -51,6 +52,16 @@ describe("/admin/products", () => {
     ).toBeTruthy()
   })
 
+  it("Should have enabled workflows feature flag", function () {
+    const flagRouter = medusaContainer.resolve("featureFlagRouter")
+
+    const workflowsFlag = flagRouter.isFeatureEnabled({
+      workflows: Workflows.CreateProducts,
+    })
+
+    expect(workflowsFlag).toBe(true)
+  })
+
   describe("POST /admin/products", () => {
     beforeEach(async () => {
       await productSeeder(dbConnection)