feat(dashboard,admin-sdk,admin-shared,admin-vite-plugin): Add support for UI extensions (#7383)

* intial work

* update lock

* add routes and fix HMR of configs

* cleanup

* rm imports

* rm debug from plugin

* address feedback

* address feedback

packages/admin-next/admin-sdk/src/lib/develop.ts

@@ -1,4 +1,5 @@
 import express from "express"
+import type { InlineConfig } from "vite"
 
 import { BundlerOptions } from "../types"
 import { getViteConfig } from "./config"
@@ -10,14 +11,22 @@ export async function develop(options: BundlerOptions) {
 
   try {
     const viteConfig = await getViteConfig(options)
+
+    const developConfig: InlineConfig = {
+      mode: "development",
+      logLevel: "warn",
+    }
+
     const server = await vite.createServer(
-      vite.mergeConfig(viteConfig, { logLevel: "info", mode: "development" })
+      vite.mergeConfig(viteConfig, developConfig)
     )
 
     router.use(server.middlewares)
   } catch (error) {
     console.error(error)
-    throw new Error("Could not start development server")
+    throw new Error(
+      "Failed to start admin development server. See error above."
+    )
   }
 
   return router