Refine Writer detection to avoid collision with Protobuf.js

[tomayac]

There was a collision with Protobuf.js which also matched Writer.create(, so the new version now checks for await Writer.create(.

---

Test websites:

• https://chrome.dev/web-ai-demos/writer-rewriter-api-playground/

[github-actions]

https://almanac.httparchive.org/en/2022/

WPT result details

Changed custom metrics values:

{
  "_fugu-apis": {
    "Device Memory": [
      "https://almanac.httparchive.org/static/js/send-web-vitals.js?v=67574c23a511f3149c90c88735c5a6f3"
    ]
  }
}

https://chrome.dev/web-ai-demos/writer-rewriter-api-playground

WPT result details

Changed custom metrics values:

{
  "_fugu-apis": {
    "Async Clipboard": [
      "https://chrome.dev/web-ai-demos/writer-rewriter-api-playground/script.js"
    ],
    "Writer": [
      "https://chrome.dev/web-ai-demos/writer-rewriter-api-playground/script.js"
    ],
    "Rewriter": [
      "https://chrome.dev/web-ai-demos/writer-rewriter-api-playground/script.js"
    ]
  }
}