feat(server): add async context manager support to EventQueue (format)

Author: cchinchilla-dev

src/a2a/server/events/event_queue.py

@@ -6,7 +6,7 @@
 
 from typing_extensions import Self
 
-from a2a.types import (
+from a2a.types.a2a_pb2 import (
     Message,
     Task,
     TaskArtifactUpdateEvent,

tests/server/events/test_event_queue.py

@@ -77,6 +77,7 @@ def test_constructor_invalid_max_queue_size() -> None:
     ):
         EventQueue(max_queue_size=-10)
 
+
 @pytest.mark.asyncio
 async def test_event_queue_async_context_manager(
     event_queue: EventQueue,