Regenerate genai tracked object descriptions (#13930)

* add genai to frigateconfig

* add regenerate button if genai is enabled

* add endpoint and new zmq pub/sub model

* move publisher to app

* dont override

* logging

* debug timeouts

* clean up

* clean up

* allow saving of empty description

* ensure descriptions can be empty

* update search detail when results change

* revalidate explore page on focus

* global mutate hook

* description websocket hook and dispatcher

* revalidation and mutation

* fix merge conflicts

* update tests

* fix merge conflicts

* fix response message

* fix response message

* fix fastapi

* fix test

* remove log

* json content

* fix content response

* more json content fixes

* another one

frigate/comms/event_metadata_updater.py

@@ -0,0 +1,44 @@
+"""Facilitates communication between processes."""
+
+import logging
+from enum import Enum
+from typing import Optional
+
+from .zmq_proxy import Publisher, Subscriber
+
+logger = logging.getLogger(__name__)
+
+
+class EventMetadataTypeEnum(str, Enum):
+    all = ""
+    regenerate_description = "regenerate_description"
+
+
+class EventMetadataPublisher(Publisher):
+    """Simplifies receiving event metadata."""
+
+    topic_base = "event_metadata/"
+
+    def __init__(self, topic: EventMetadataTypeEnum) -> None:
+        topic = topic.value
+        super().__init__(topic)
+
+
+class EventMetadataSubscriber(Subscriber):
+    """Simplifies receiving event metadata."""
+
+    topic_base = "event_metadata/"
+
+    def __init__(self, topic: EventMetadataTypeEnum) -> None:
+        topic = topic.value
+        super().__init__(topic)
+
+    def check_for_update(
+        self, timeout: float = None
+    ) -> Optional[tuple[EventMetadataTypeEnum, any]]:
+        return super().check_for_update(timeout)
+
+    def _return_object(self, topic: str, payload: any) -> any:
+        if payload is None:
+            return (None, None)
+        return (EventMetadataTypeEnum[topic[len(self.topic_base) :]], payload)