Redundant allocation and memory copy in ranged S3 reader _read_unbuffered

[clumsy]

s3torchconnector version

1.4.3

s3torchconnectorclient version

1.4.3

AWS Region

No response

Describe the running environment

Any environment

What happened?

chunk is PyBytes and chunk[:chunk_size] will create and copy this bytearray in https://github.com/awslabs/s3-connector-for-pytorch/blob/main/s3torchconnector/src/s3torchconnector/s3reader/ranged.py#L151

Instead we should use memoryview to use lightweight pointer arithmetic

Relevant log output

Code of Conduct

• I agree to follow this project's Code of Conduct

[jet-tong]

#382 fixes this issue - thanks for your contribution!

Will close issue on our next version release.