📊Tracking: AWS Transfer for SFTP

Add your +1 👍 to help us prioritize high-level constructs for this service
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### Overview:

AWS Transfer for SFTP (AWS SFTP) is a fully managed AWS service that enables you to transfer files over Secure File Transfer Protocol (SFTP), into and out of Amazon Simple Storage Service (Amazon S3) storage. SFTP is also known as Secure Shell (SSH) File Transfer Protocol. SFTP is used in data exchange workflows across different industries such as financial services, healthcare, advertising, and retail, among others.

[AWS Docs](https://docs.aws.amazon.com/transfer/latest/userguide/what-is-aws-transfer-for-sftp.html)

### Maturity: CloudFormation Resources Only

See the [AWS Construct Library Module Lifecycle doc](https://github.com/aws/aws-cdk-rfcs/blob/master/text/0107-construct-library-module-lifecycle.md) for more information about maturity levels.

### Implementation:

See the [CDK API Reference](https://docs.aws.amazon.com/cdk/api/latest/docs/aws-transfer-readme.html) for more implementation details.

### Issue list:

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This is a 📊Tracking Issue

Start with the linked AWS Transfer for SFTP documentation and the AWS CDK API Reference. This tracking issue names no files, tests, or implementation entry points and asks for prioritization rather than a specific change. There is no concrete definition of done beyond future high-level construct work.

Written by the indexing model from the issue text.