Consider a higher default thread pool size for S3 SDK V2 Transfer Manager

The TRANSFER_MANAGER_THREAD_POOL_SIZE_DEFAULT value, used as the default value for configuring the s3 transfer manager thread pool size, is 10.

Nevertheless, while upgrading to AWS SDK V2 (NXP-32315), we have figured out that the SDK sets the pool size to 100 by default. See https://github.com/aws/aws-sdk-java-v2/blob/2.28.2/services-custom/s3-transfer-manager/src/main/java/software/amazon/awssdk/transfer/s3/internal/TransferManagerConfiguration.java#L81

Should we consider a higher default Nuxeo value (if any) for performance and transfer speed sake?

Consideration: we must have set this default value to 10 in the past after running benchmarks that told us it was the most suitable and sustainable under heavy import/export. This was however with SDK v1.