chore: import upstream snapshot with attribution

tests/python/shared/tasks/interface.py

@@ -0,0 +1,19 @@
+# Copyright (C) CVAT.ai Corporation
+#
+# SPDX-License-Identifier: MIT
+
+from abc import ABCMeta, abstractmethod
+
+from cvat_sdk.api_client import models
+from PIL import Image
+
+from shared.tasks.enums import SourceDataType
+
+
+class ITaskSpec(models.ITaskWriteRequest, models.IDataRequest, metaclass=ABCMeta):
+    size: int
+    frame_step: int
+    source_data_type: SourceDataType
+
+    @abstractmethod
+    def read_frame(self, i: int) -> Image.Image: ...