[aws-cpp-sdk-s3-crt]: please expose existing aws-c-s3 CopyObject

[grrtrr]

Problem Description

The C++ SDK provides the CopyObject[Async] request for s3 copy operations.
Despite the support for CopyObject in aws-c-s3 since awslabs/aws-c-s3#166, the S3CrtClient is still using the AWSXMLClient for launching CopyObject requests.

This has the following problems:

1. The AWSXMLClient CopyObject request only supports copying of objects < 5GB.
2. Users thus have to re-implement most of the aws-c-s3 CopyObject code (initial HeadObject, determine chunk size, parallel UploadPartCopy requests, and handling completion or abort of the multipart upload).
3. There is an existing issue S3 CopyObject fails with version id #2103 with AWSXMLClient CopyObject, which also affects the CRT code.

Proposed Solution

Please make the existing aws-c-s3 support for CopyObject available as CopyObjectAsync and CopyObject in the S3CrtClient.

Acknowledgements

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

[jmklix]

Looking into if we want to re-enable this.

[sbiscigl]

merged your change + our changes for code generation, it should be going out today! thanks for working with us on this

[github-actions]

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