step 6: add animation and high rate update stress tests

src/dpg_gauges/diagnostics.py

@@ -25,6 +25,17 @@ def get_gauge_debug_state(tag: Tag) -> dict[str, Any]:
         "config_revision": state.config_revision,
         "animation_active": state.animation_state.active,
         "smoothing_active": state.smoothing_state.active,
+        "animation": {
+            "start_value": state.animation_state.start_value,
+            "target_value": state.animation_state.target_value,
+            "started_at": state.animation_state.started_at,
+            "duration": state.animation_state.duration,
+            "active": state.animation_state.active,
+        },
+        "smoothing": {
+            "value": state.smoothing_state.value,
+            "active": state.smoothing_state.active,
+        },
     }
     if state.renderer is not None:
         debug["renderer"] = state.renderer.debug_state()