Make types and actor accessible

The actor will need to be started somehow.
Until integration into the SDK, the user has to do it themselves.

Author: Marenz

src/frequenz/dispatch/__init__.py

@@ -9,7 +9,11 @@
 
 from frequenz.dispatch.actor import DispatchActor, DispatchEvent
 
-__all__ = ["Dispatcher"]
+DispatchReceiver = Receiver[Dispatch]
+"""Type alias for a dispatch receiver."""
+
+DispatchEventReceiver = Receiver[DispatchEvent]
+"""Type alias for a dispatch event receiver."""
 
 
 class Dispatcher:
@@ -57,6 +61,15 @@ def __init__(
             self._ready_channel.new_sender(),
         )
 
+    @property
+    def actor(self) -> DispatchActor:
+        """Return the actor.
+
+        Returns:
+            The actor.
+        """
+        return self._actor
+
     async def start(self) -> None:
         """Start the actor."""
         self._actor.start()