Increase mypy coverage and fixes (#22632)

frigate/motion/__init__.py

@@ -13,10 +13,10 @@ class MotionDetector(ABC):
         frame_shape: Tuple[int, int, int],
         config: MotionConfig,
         fps: int,
-        improve_contrast,
-        threshold,
-        contour_area,
-    ):
+        improve_contrast: bool,
+        threshold: int,
+        contour_area: int | None,
+    ) -> None:
         pass
 
     @abstractmethod
@@ -25,7 +25,7 @@ class MotionDetector(ABC):
         pass
 
     @abstractmethod
-    def is_calibrating(self):
+    def is_calibrating(self) -> bool:
         """Return if motion is recalibrating."""
         pass
 
@@ -35,6 +35,6 @@ class MotionDetector(ABC):
         pass
 
     @abstractmethod
-    def stop(self):
+    def stop(self) -> None:
         """Stop any ongoing work and processes."""
         pass