[Storage] Add x-ms-creation-time to response on download

[vincenttran-msft]

This PR simply generates on the new swagger that will allow for x-ms-creation-time to be properly parsed from the response headers and populate the properties.

[azure-sdk]

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azure-storage-blob

[jalauzon-msft]

Hmm I'm hesitant for us to take all the additional changes from the updated autorest version directly into main with the upcoming GA release. It may be better for us to try and re-generate with whichever version of autorest was previously used to limit the changes to only the new stuff for creation-time. You can force an autorest version when generating the code but we'll just need to figure out which version.

Also, maybe we should add a test? Or find a test to add a check for the property to?

[vincenttran-msft]

Hmm I'm hesitant for us to take all the additional changes from the updated autorest version directly into main with the upcoming GA release. It may be better for us to try and re-generate with whichever version of autorest was previously used to limit the changes to only the new stuff for creation-time. You can force an autorest version when generating the code but we'll just need to figure out which version.

Also, maybe we should add a test? Or find a test to add a check for the property to?

Good point. I was not aware that the updated autorest version also got slapped in there, but I definitely agree we should drop the autorest version to only introduce the intended change (x-ms-creation-time header on response). Let's circle back to this later 😄