chore: import upstream snapshot with attribution

python/semantic_kernel/const.py

@@ -0,0 +1,11 @@
+# Copyright (c) Microsoft. All rights reserved.
+
+from typing import Final
+
+METADATA_EXCEPTION_KEY: Final[str] = "exception"
+DEFAULT_SERVICE_NAME: Final[str] = "default"
+USER_AGENT: Final[str] = "User-Agent"
+PARSED_ANNOTATION_UNION_DELIMITER: Final[str] = ","
+DEFAULT_FULLY_QUALIFIED_NAME_SEPARATOR: Final[str] = "-"
+
+AUTO_FUNCTION_INVOCATION_SPAN_NAME: Final[str] = "AutoFunctionInvocationLoop"