fixup! Implement ListComponents

Add Component.identity property

Author: llucax

src/frequenz/client/microgrid/component/_base.py

@@ -117,6 +117,16 @@ def active(self) -> bool:
         """Whether this component is currently active."""
         return self.active_at(datetime.now(timezone.utc))
 
+    @property
+    def identity(self) -> tuple[ComponentId, MicrogridId]:
+        """The identity of this component.
+
+        This uses the component ID and microgrid ID to identify a component
+        without considering the other attributes, so even if a component state
+        changed, the identity remains the same.
+        """
+        return (self.id, self.microgrid_id)
+
     def __str__(self) -> str:
         """Return a human-readable string representation of this instance."""
         name = f":{self.name}" if self.name else ""