Increase I/O operation timeout for S3

[Alan-Liang]

The timeout layer in "opendal" defaults to a I/O timeout of 10 s, which is not enough for some large files.

logs

2025-11-07T03:21:41.692056Z  INFO rsync_fetcher::rsync::receiver: receiver started.
2025-11-07T03:22:43.568357Z  WARN opendal::layers::retry: will retry after 1s because: Unexpected (temporary) at Writer::write, context: { timeout: 10 } => io operation timeout reached    
2025-11-07T03:22:54.571822Z  WARN opendal::layers::retry: will retry after 2s because: Unexpected (temporary) at Writer::write, context: { timeout: 10 } => io operation timeout reached    
2025-11-07T03:23:00.654269Z  WARN opendal::layers::retry: will retry after 1s because: Unexpected (temporary) at Writer::write, context: { timeout: 10 } => io operation timeout reached    
2025-11-07T03:23:06.920580Z  WARN opendal::layers::retry: will retry after 4s because: Unexpected (temporary) at Writer::write, context: { timeout: 10 } => io operation timeout reached    
2025-11-07T03:23:11.656872Z  WARN opendal::layers::retry: will retry after 2s because: Unexpected (temporary) at Writer::write, context: { timeout: 10 } => io operation timeout reached    
2025-11-07T03:23:16.953716Z  WARN opendal::layers::retry: will retry after 1s because: Unexpected (temporary) at Writer::write, context: { timeout: 10 } => io operation timeout reached    
2025-11-07T03:23:21.168122Z  INFO rsync_fetcher::rsync::uploader: uploader dropped
Error: 
   0: Unexpected (persistent) at Writer::write, context: { timeout: 10 } => io operation timeout reached

Location:
   rsync-fetcher/src/rsync/uploader.rs:152

We need to increase the timeout specified in

rsync-sjtug/rsync-core/src/s3.rs

Line 23 in 62c5df8

.layer(TimeoutLayer::new())

[PhotonQuantum]

Currently, we download from S3 with chunk size 10M. This means our download speed is lower than 1Mb/s.

Instead of modifying timeout, I suggest we can change UPLOAD_CHUNK_SIZE and DOWNLOAD_CHUNK_SIZE to 1Mb.