chore: import upstream snapshot with attribution

python/semantic_kernel/contents/utils/author_role.py

@@ -0,0 +1,12 @@
+# Copyright (c) Microsoft. All rights reserved.
+from enum import Enum
+
+
+class AuthorRole(str, Enum):
+    """Author role enum."""
+
+    SYSTEM = "system"
+    USER = "user"
+    ASSISTANT = "assistant"
+    TOOL = "tool"
+    DEVELOPER = "developer"