feat: view config feature flag (#13171)

* feat: add view_configurations feature flag

  - Add feature flag provider and hooks to admin dashboard
  - Add backend API endpoint for feature flags
  - Create view_configurations feature flag (disabled by default)
  - Update order list table to use legacy version when flag is disabled
  - Can be enabled with MEDUSA_FF_VIEW_CONFIGURATIONS=true env var

* fix: naming

* fix: feature flags unauthenticated

* fix: add test

packages/medusa/src/api/admin/feature-flags/route.ts

@@ -0,0 +1,26 @@
+import {
+  MedusaRequest,
+  MedusaResponse,
+} from "@medusajs/framework/http"
+import { ContainerRegistrationKeys } from "@medusajs/framework/utils"
+
+export const AUTHENTICATE = false
+
+export const GET = async (
+  req: MedusaRequest,
+  res: MedusaResponse<{ feature_flags: Record<string, boolean> }>
+) => {
+  const featureFlagRouter = req.scope.resolve(
+    ContainerRegistrationKeys.FEATURE_FLAG_ROUTER
+  ) as any
+  
+  const flags = featureFlagRouter.listFlags()
+  
+  // Convert array of flags to a simple key-value object
+  const featureFlags: Record<string, boolean> = {}
+  flags.forEach(flag => {
+    featureFlags[flag.key] = flag.value
+  })
+  
+  res.json({ feature_flags: featureFlags })
+}