Audio transcription support (#18398)

* install new packages for transcription support

* add config options

* audio maintainer modifications to support transcription

* pass main config to audio process

* embeddings support

* api and transcription post processor

* embeddings maintainer support for post processor

* live audio transcription with sherpa and faster-whisper

* update dispatcher with live transcription topic

* frontend websocket

* frontend live transcription

* frontend changes for speech events

* i18n changes

* docs

* mqtt docs

* fix linter

* use float16 and small model on gpu for real-time

* fix return value and use requestor to embed description instead of passing embeddings

* run real-time transcription in its own thread

* tweaks

* publish live transcriptions on their own topic instead of tracked_object_update

* config validator and docs

* clarify docs

web/src/views/explore/ExploreView.tsx

@@ -75,13 +75,13 @@ export default function ExploreView({
     }, {});
   }, [events]);
 
-  const trackedObjectUpdate = useTrackedObjectUpdate();
+  const { payload: wsUpdate } = useTrackedObjectUpdate();
 
   useEffect(() => {
-    mutate();
-    // mutate / revalidate when event description updates come in
-    // eslint-disable-next-line react-hooks/exhaustive-deps
-  }, [trackedObjectUpdate]);
+    if (wsUpdate && wsUpdate.type == "description") {
+      mutate();
+    }
+  }, [wsUpdate, mutate]);
 
   // update search detail when results change