Support `aws-c-s3`

### Describe the feature

Natively supporting [`aws-c-s3`](https://github.com/awslabs/aws-c-s3) would be great to improve S3 operations from Node.js, like transparent multipart upload.

### Use Case

Transparent multipart upload.

### Proposed Solution

Just like other SDKs, add `aws-crt/s3` to bind `aws-c-s3`.

### Other Information

- `aws-crt-python`: https://awslabs.github.io/aws-crt-python/api/s3.html#
- `aws-crt-java`: https://awslabs.github.io/aws-crt-java/software/amazon/awssdk/crt/s3/package-summary.html

### Acknowledgements

- [ ] I may be able to implement this feature request
- [ ] This feature might incur a breaking change

Start by reviewing the existing Node.js SDK bindings and the aws-crt-python and aws-crt-java S3 APIs linked in the issue. Define the aws-crt/s3 entry point around aws-c-s3 and verify transparent multipart upload; the issue names no tests or files, so validation details remain to be established.

Written by the indexing model from the issue text.