Generalize postprocessing (#15931)

* Actually send result to face registration

* Define postprocessing api and move face processing to fit

* Standardize request handling

* Standardize handling of processors

* Rename processing metrics

* Cleanup

* Standardize object end

* Update to newer formatting

* One more

* One more

frigate/types.py

@@ -2,13 +2,13 @@ from enum import Enum
 from typing import TypedDict
 
 from frigate.camera import CameraMetrics
-from frigate.embeddings.types import EmbeddingsMetrics
 from frigate.object_detection import ObjectDetectProcess
+from frigate.postprocessing.types import PostProcessingMetrics
 
 
 class StatsTrackingTypes(TypedDict):
     camera_metrics: dict[str, CameraMetrics]
-    embeddings_metrics: EmbeddingsMetrics | None
+    embeddings_metrics: PostProcessingMetrics | None
     detectors: dict[str, ObjectDetectProcess]
     started: int
     latest_frigate_version: str