Allow using full tensorflow in cpu/edgetpu detector plugins (#5611)

It supports the same entrypoints, given that tflite is a small cut-out
of the big tensorflow picture.

This patch was created for downstream usage in nixpkgs, where we don't
have the tflite python package, but do have the full tensorflow package.

frigate/detectors/plugins/cpu_tfl.py

@@ -5,7 +5,11 @@ from frigate.detectors.detection_api import DetectionApi
 from frigate.detectors.detector_config import BaseDetectorConfig
 from typing import Literal
 from pydantic import Extra, Field
-import tflite_runtime.interpreter as tflite
+
+try:
+    from tflite_runtime.interpreter import Interpreter
+except ModuleNotFoundError:
+    from tensorflow.lite.python.interpreter import Interpreter
 
 
 logger = logging.getLogger(__name__)
@@ -22,7 +26,7 @@ class CpuTfl(DetectionApi):
     type_key = DETECTOR_KEY
 
     def __init__(self, detector_config: CpuDetectorConfig):
-        self.interpreter = tflite.Interpreter(
+        self.interpreter = Interpreter(
             model_path=detector_config.model.path or "/cpu_model.tflite",
             num_threads=detector_config.num_threads or 3,
         )