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

frigate/app.py

@@ -497,7 +497,9 @@ class FrigateApp:
         ]
 
         if audio_cameras:
-            self.audio_process = AudioProcessor(audio_cameras, self.camera_metrics)
+            self.audio_process = AudioProcessor(
+                self.config, audio_cameras, self.camera_metrics
+            )
             self.audio_process.start()
             self.processes["audio_detector"] = self.audio_process.pid or 0