chore: import upstream snapshot with attribution

doc/source/serve/tutorials/video-analysis/utils/s3.py

@@ -0,0 +1,8 @@
+import boto3
+
+def get_s3_region(bucket: str) -> str:  
+    """Get the region of the S3 bucket"""
+    s3 = boto3.client("s3")
+    response = s3.get_bucket_location(Bucket=bucket)
+    # AWS returns None for us-east-1, otherwise returns the region name
+    return response["LocationConstraint"] or "us-east-1"