feat(dashboard,admin-vite-plugin,admin-bundler,admin-sdk): Rework admin extensions and introduce custom fields API (#9338)

packages/admin/dashboard/tsup.config.cjs

@@ -1,10 +1,16 @@
-import { VIRTUAL_MODULES } from "@medusajs/admin-shared"
 import { defineConfig } from "tsup"
 
 export default defineConfig({
   entry: ["./src/app.tsx"],
   format: ["cjs", "esm"],
-  external: [...VIRTUAL_MODULES, "virtual:config"],
+  external: [
+    "virtual:medusa/forms",
+    "virtual:medusa/displays",
+    "virtual:medusa/routes",
+    "virtual:medusa/links",
+    "virtual:medusa/menu-items",
+    "virtual:medusa/widgets",
+  ],
   tsconfig: "tsconfig.build.json",
   clean: true,
 })