allow s3 blobstores to utilize transfer acceleration

https://docs.aws.amazon.com/AmazonS3/latest/dev/transfer-acceleration.html

Transfer acceleration can potentially speed up HTTP uploads to S3 blobstores.

S3 blobstores currently use the domain name bucketname.s3.amazonaws.com when interacting with S3.

Once configured for an S3 bucket, Transfer acceleration requires accessing bucketname.s3-accelerate.amazonaws.com instead to make use of it.

Per single hosted repository file upload, Nexus 3 will make multiple multi-part uploads and other supporting HTTP requests to S3 REST APIs.

Providing a simple way for nexus to support hitting the accelerate endpoint may increase the throughput to an S3 blobstore for a user.

Expected

Provide a supported way to support accelerate transfer.

Document it.