Add Handwriting Recognition API (#1377)

Close #1376, adding the suggested spec to the list.

### Changes to `index.json`
This update would trigger the following changes in `index.json`:

<details><summary>Add spec (1)</summary>

```json
{
  "url": "https://wicg.github.io/handwriting-recognition/",
  "seriesComposition": "full",
  "shortname": "handwriting-recognition",
  "series": {
    "shortname": "handwriting-recognition",
    "currentSpecification": "handwriting-recognition",
    "title": "Handwriting Recognition API",
    "shortTitle": "Handwriting Recognition API",
    "nightlyUrl": "https://wicg.github.io/handwriting-recognition/"
  },
  "organization": "W3C",
  "groups": [
    {
      "name": "Web Platform Incubator Community Group",
      "url": "https://www.w3.org/community/wicg/"
    }
  ],
  "nightly": {
    "url": "https://wicg.github.io/handwriting-recognition/",
    "status": "Draft Community Group Report",
    "alternateUrls": [],
    "repository": "https://github.com/WICG/handwriting-recognition",
    "sourcePath": "spec.bs",
    "filename": "index.html"
  },
  "title": "Handwriting Recognition API",
  "source": "spec",
  "shortTitle": "Handwriting Recognition API",
  "categories": [
    "browser"
  ],
  "standing": "good"
}
```
</details>

### Tests
These changes look good! 😎

Co-authored-by: browser-specs-bot <>

specs.json

@@ -644,6 +644,7 @@
   "https://wicg.github.io/file-system-access/",
   "https://wicg.github.io/first-party-sets/",
   "https://wicg.github.io/get-installed-related-apps/spec/",
+  "https://wicg.github.io/handwriting-recognition/",
   "https://wicg.github.io/idle-detection/",
   "https://wicg.github.io/ink-enhancement/",
   "https://wicg.github.io/input-device-capabilities/",

src/data/monitor.json

@@ -164,10 +164,6 @@
       "lastreviewed": "2024-03-01",
       "comment": "no published content yet"
     },
-    "WICG/handwriting-recognition": {
-      "lastreviewed": "2024-03-01",
-      "comment": "Original trial in Chromium but no intent to implement announced yet"
-    },
     "immersive-web/marker-tracking": {
       "lastreviewed": "2024-03-01",
       "comment": "marked as unstable API"