feat(dashboard, medusa) add metadata to pages (#9433)

**WIP**
- add metadata component and edit route to missing pages
- fix API issues around metadata in certain domains

---

FIXES CC-554

packages/core/types/src/http/user/admin/payloads.ts

@@ -9,4 +9,5 @@ export interface AdminUpdateUser {
   first_name?: string | null
   last_name?: string | null
   avatar_url?: string | null
+  metadata?: Record<string, unknown> | null
 }