Update proto file paths for grid/delivery_area

The file `grid.proto` contained a `DeliveryArea` message. This file has
now been renamed to `grid/delivery_area.proto`.

Signed-off-by: Tiyash Basu <[email protected]>

Author: tiyash-basu-frequenz

proto/frequenz/api/common/v1/grid.proto renamed to proto/frequenz/api/common/v1/grid/delivery_area.proto

@@ -9,7 +9,7 @@ syntax = "proto3";
 
 package frequenz.api.common.v1.microgrid;
 
-import "frequenz/api/common/v1/grid.proto";
+import "frequenz/api/common/v1/grid/delivery_area.proto";
 import "frequenz/api/common/v1/location.proto";
 
 import "google/protobuf/timestamp.proto";

proto/frequenz/api/common/v1/microgrid/microgrid.proto

@@ -41,14 +41,22 @@ def test_module_import_metrics_electrical() -> None:
 def test_module_import_grid() -> None:
     """Test that the modules can be imported."""
     # pylint: disable=import-outside-toplevel
-    from frequenz.api.common.v1 import grid_pb2
+    from frequenz.api.common.v1 import grid
+
+    assert grid is not None
 
-    assert grid_pb2 is not None
 
+def test_module_import_grid_delivery_area() -> None:
+    """Test that the modules can be imported."""
     # pylint: disable=import-outside-toplevel
-    from frequenz.api.common.v1 import grid_pb2_grpc
+    from frequenz.api.common.v1.grid import delivery_area_pb2
 
-    assert grid_pb2_grpc is not None
+    assert delivery_area_pb2 is not None
+
+    # pylint: disable=import-outside-toplevel
+    from frequenz.api.common.v1.grid import delivery_area_pb2_grpc
+
+    assert delivery_area_pb2_grpc is not None
 
 
 def test_module_import_microgrid() -> None: