Refactor detector and model management (#23995)

* Refactor detector and model management

* Fix model resolution field

frigate/detectors/plugins/edgetpu_tfl.py

@@ -1,7 +1,7 @@
 import logging
 import math
 import os
-from typing import Literal
+from typing import ClassVar, Literal
 
 import cv2
 import numpy as np
@@ -28,6 +28,9 @@ class EdgeTpuDetectorConfig(BaseDetectorConfig):
         title="EdgeTPU",
     )
 
+    # a TPU can only be opened by one process
+    shareable: ClassVar[bool] = False
+
     type: Literal[DETECTOR_KEY]
     device: str = Field(
         default=None,