(0.12.4 cherry-pick): aws: support copies >5GB#562

james-rms wants to merge 2 commits intoapache:mainapache/arrow-rs-object-store:mainfrom

james-rms:jrms/0.12.4-aws-copy-etcjames-rms/arrow-rs-object-store:jrms/0.12.4-aws-copy-etcCopy head branch name to clipboard