Use Event message from common api (#270)

fixes #231

Author: Marenz

RELEASE_NOTES.md

@@ -2,6 +2,7 @@
 
 ## Summary
 
+- Use `frequenz.api.common.v1alpha8.streaming.Event` message instead of the local `Event` message.
 - Updated all `frequenz.api.common` imports from `v1` to `v1alpha8`.
 - Removed the `TimeIntervalFilter` message, replacing its usage with the new `frequenz.api.common.v1alpha8.types.Interval` type.
 - In the `DispatchFilter` message, the `start_time_interval`, `end_time_interval`, and `update_time_interval` fields were updated to use the new `Interval` type.

proto/frequenz/api/dispatch/v1/dispatch.proto

@@ -20,6 +20,7 @@ import "google/protobuf/timestamp.proto";
 import "frequenz/api/common/v1alpha8/microgrid/electrical_components/electrical_components.proto";
 import "frequenz/api/common/v1alpha8/pagination/pagination_info.proto";
 import "frequenz/api/common/v1alpha8/pagination/pagination_params.proto";
+import "frequenz/api/common/v1alpha8/streaming/event.proto";
 import "frequenz/api/common/v1alpha8/types/interval.proto";
 
 // Service providing operations related to dispatching microgrid components.
@@ -95,25 +96,11 @@ message StreamMicrogridDispatchesRequest {
 // Response to a subscription request for a stream of microgrid dispatches.
 // Real-time information on dispatches affecting a certain microgrid are pushed through this response.
 message StreamMicrogridDispatchesResponse {
-  enum Event {
-    // Default, unspecified event
-    EVENT_UNSPECIFIED = 0;
-
-    // A new dispatch has been created
-    EVENT_CREATED = 1;
-
-    // An existing dispatch has been updated
-    EVENT_UPDATED = 2;
-
-    // An existing dispatch has been deleted
-    EVENT_DELETED = 3;
-  }
-
   // Dispatch record returned.
   Dispatch dispatch = 1;
 
   // Which event this response was triggered by
-  Event event = 2;
+  frequenz.api.common.v1alpha8.streaming.Event event = 2;
 }
 
 // Represents a dispatches data, including its type, start time, duration,