Add WebNN and WebMCP detection

[tomayac]

Resolves #1

Adds WebNN and WebMCP detection.

---

Test websites:

• https://webmachinelearning.github.io/webnn-samples/lenet/
• https://webmcp.dev/

(WebMCP can't really be tested yet.)

[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://webmachinelearning.github.io/webnn-samples/lenet

WPT result details

Changed custom metrics values:

{
  "_fugu-apis": {
    "WebNN": [
      "https://webmachinelearning.github.io/webnn-samples/common/component/component.js",
      "https://webmachinelearning.github.io/webnn-samples/common/utils.js"
    ]
  }
}

https://webmcp.dev

WPT result details

Changed custom metrics values:

{
  "_fugu-apis": []
}

[tunetheweb]

LGTM. Why can WebMCP really be detected yet? Not in stable yet?

[tomayac]

Definitely not yet in stable, and I also couldn't find a demo page that was deployed somewhere public. It's early days.