Surface user in SDK to template (#45)

Towards github/spark#104

Relies on github/workbench-sdk#275 and should be
merged + prebuilt as soon as possible after.

* Adds necessary proxying for vite to get us working in dev
* Moves to import from the new shared spark file instead of llm to get
the window setup (which also imports the LLM bits...)

Author: jasonrclark

src/main.tsx

@@ -8,7 +8,7 @@ if (import.meta.env.MODE == 'development') {
     await import('@github/spark/initializeTelemetry');
 }
 
-import "@github/spark/llm"
+import "@github/spark/spark"
 
 createRoot(document.getElementById('root')!).render(
     <App />

vite.config.ts

@@ -74,6 +74,10 @@ export default defineConfig({
         target: "http://localhost:8000",
         changeOrigin: true,
       },
+      "/_spark/user": {
+        target: "http://localhost:8000",
+        changeOrigin: true,
+      },
     },
   },
   resolve: {