build(server-renderer): Add ESM as a build target (#4209)

packages/server-renderer/package.json

@@ -3,13 +3,16 @@
   "version": "3.2.0-beta.6",
   "description": "@vue/server-renderer",
   "main": "index.js",
+  "module": "dist/server-renderer.esm-bundler.js",
   "types": "dist/server-renderer.d.ts",
   "files": [
     "index.js",
     "dist"
   ],
   "buildOptions": {
+    "name": "VueServerRenderer",
     "formats": [
+      "esm-bundler",
       "cjs"
     ]
   },