Support Multipart Copy in transfer manager

[aajtodd]

Describe the feature

Add support for multipart copy API to transfer manager utility similar to Downloader and Uploader APIs

Use Case

Efficient multipart copy between buckets in same region and cross region.

Proposed Solution

Community PR for Gov1 as inspiration: aws/aws-sdk-go#2653

Important considerations:

• preservation (or not) of object metadata
• in-region and cross-region copy support (Java only supports in-region currently, tx mgr SEP does not yet address copy as cross-region is tricky).

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

AWS Go SDK V2 Module Versions Used

N/A

Go version used

N/A

[aajtodd]

see also #2036

[rusenask]

with aws/aws-sdk-go#2653 closed, this doesn't seem to be getting much progress. Should the previous PR be merged then @RanVaknin ? If you are sunsetting https://github.com/aws/aws-sdk-go in favour of aws-sdk-go-v2 then does it make sense to leave the bug open? :D

[hbaackmann]

Coming here from aws/aws-sdk-go#2653, just wanted to upvote this feature request and underscore the usefulness of a multipart copy feature.

[eko]

I am also really interested in having the S3 multipart copy support in the manager! Upvoting :-)