MQTT: Birdseye enabled/disabled and mode change support (#8291)

* support enabled and mode change for birdseye via mqtt

* resolve feedback from PR review
https://github.com/blakeblackshear/frigate/pull/8291#discussion_r1370083613

* change birdseye mode topic to set

* type in the docs

* these commented out lines should have never been in here

frigate/app.py

@@ -21,7 +21,7 @@ from frigate.comms.dispatcher import Communicator, Dispatcher
 from frigate.comms.inter_process import InterProcessCommunicator
 from frigate.comms.mqtt import MqttClient
 from frigate.comms.ws import WebSocketClient
-from frigate.config import FrigateConfig
+from frigate.config import BirdseyeModeEnum, FrigateConfig
 from frigate.const import (
     CACHE_DIR,
     CLIPS_DIR,
@@ -169,6 +169,20 @@ class FrigateApp:
                 "process": None,
                 "audio_rms": mp.Value("d", 0.0),  # type: ignore[typeddict-item]
                 "audio_dBFS": mp.Value("d", 0.0),  # type: ignore[typeddict-item]
+                "birdseye_enabled": mp.Value(  # type: ignore[typeddict-item]
+                    # issue https://github.com/python/typeshed/issues/8799
+                    # from mypy 0.981 onwards
+                    "i",
+                    self.config.cameras[camera_name].birdseye.enabled,
+                ),
+                "birdseye_mode": mp.Value(  # type: ignore[typeddict-item]
+                    # issue https://github.com/python/typeshed/issues/8799
+                    # from mypy 0.981 onwards
+                    "i",
+                    BirdseyeModeEnum.get_index(
+                        self.config.cameras[camera_name].birdseye.mode.value
+                    ),
+                ),
             }
             self.ptz_metrics[camera_name] = {
                 "ptz_autotracker_enabled": mp.Value(  # type: ignore[typeddict-item]
@@ -455,6 +469,7 @@ class FrigateApp:
             args=(
                 self.config,
                 self.video_output_queue,
+                self.camera_metrics,
             ),
         )
         output_processor.daemon = True