aws/types: include a benchmark to test ordered writes to WriteAtBuffer
aws/types: include a benchmark to test ordered writes to WriteAtBuffer

This is similar to downloading an object from S3, where chunks of the
object are typically downloaded in an ordered fashion, i.e. the first
chunk first, then the second, until the last.

zmarois/aws-sdk-go,radeksimko/aws-sdk-go,myshen/aws-sdk-go,xibz/aws-sdk-go,jjeffery/aws-sdk-go,jjeffery/aws-sdk-go,agworld/aws-sdk-go,yxd-hde/aws-sdk-go,yxd-hde/aws-sdk-go,zmarois/aws-sdk-go,zmarois/aws-sdk-go,xibz/aws-sdk-go,agworld/aws-sdk-go,xibz/aws-sdk-go,calgaryscientific/aws-sdk-go,yxd-hde/aws-sdk-go,radeksimko/aws-sdk-go,calgaryscientific/aws-sdk-go,myshen/aws-sdk-go,jjeffery/aws-sdk-go,myshen/aws-sdk-go,radeksimko/aws-sdk-go,yxd-hde/aws-sdk-go,radeksimko/aws-sdk-go,agworld/aws-sdk-go,jasdel/aws-sdk-go,myshen/aws-sdk-go,agworld/aws-sdk-go,calgaryscientific/aws-sdk-go,xibz/aws-sdk-go,zmarois/aws-sdk-go,calgaryscientific/aws-sdk-go,aws/aws-sdk-go