Add DownloadResponse mapping

[GarrettBeatty]

Stacked PRs:

• Add DownloadInitiated, Failed and Completed events #4079
• Add UploadWithResponseAsync API #4062
• Add GetObjectResponse to TransferUtilityOpenStreamResponse mapping. #4076
• ->Add DownloadResponse mapping #4075

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Add GetObjectResponse to TransferUtilityDownloadResponse Mapping

Motivation and Context

To copy all fields to the Transfer Utility Response so we ensure completeness. this is per the SEP compliance design doc

Testing

1. ran test locally
2. ffeb46dc-8a09-4558-a777-fb2778601370 - pass

Types of changes

• [] Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project
• My change requires a change to the documentation
• I have updated the documentation accordingly
• I have read the README document
• I have added tests to cover my changes
• All new and existing tests passed

License

• I confirm that this pull request can be released under the Apache 2 license

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Pull Request Overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

[GarrettBeatty]

eventually this class will be used as the return type of transferUtility.DownloadWithResponseAsync(req)

[GarrettBeatty]

this change is needed because we need to write the test value into both the headers and the property value. previously we were writing into the property value and since we didnt write into headers there was a mismatch