Add camera-stage-mapping compliant functions to BaseStage and BaseCamera.

src/openflexure_microscope_server/things/camera/simulation.py

@@ -187,6 +187,13 @@ class SimulatedCamera(BaseCamera):
             except Exception as e:
                 logging.error(f"Failed to capture frame: {e}, retrying...")
 
+    @lt.thing_action
+    def discard_frames(self) -> None:
+        """Discard frames so that the next frame captured is fresh.
+
+        There is nothing to do as this is a simulation!
+        """
+
     @lt.thing_action
     def capture_array(
         self,