feat: Add support for Frigate reviews / detections [initial PR] (#2315)

- Add support for Frigate reviews / detections.
 - Add support for GenAI metadata.
- Significant internal refactor to more flexible "UnifiedQuery" to allow
mixing cameras with simple metadata and review metadata (e.g. a timeline
view of a Frigate camera with reviews, and a Reolink camera with simple
metadata).
 - Add support for folder media as camera media.

There are a few more PRs to commit prior to this going live, but
commiting this for now due to the scale of the change.

BREAKING CHANGE: `media_type` and `events_type` are retired under
`live`, `viewer` and `timeline` configuration sections, instead media
type is associated (once) with the camera under `media`.

src/localize/languages/de.json

@@ -116,14 +116,14 @@
       }
     },
     "common": {
+      "media_types": {
+        "events": "Ereignisse",
+        "recordings": "Aufzeichnungen"
+      },
       "controls": {
         "builtin": "Eingebettete Video Bedienelemente",
         "thumbnails": {
-          "media_type": "Ob Vorschau von Ereignissen oder Aufzeichnungen angezeigt werden",
-          "media_types": {
-            "events": "Ereignisse",
-            "recordings": "Aufzeichnungen"
-          }
+          "media_type": "Ob Vorschau von Ereignissen oder Aufzeichnungen angezeigt werden"
         },
         "timeline": {
           "format": {