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Summary
Adds the S3 Transfer manager for uploading and downloading files and folders. If a folder is detected on upload or download this will automatically switch to using the directory APIs which have much better concurrency and throughput.
This also adds a missing test suite from when we split off the CRT client, and fixes a previously unknown exception issue. As mentioned in the new CRT docblock, we need to revisit our entire blobfs abstraction as the current design isn't working well with the direction of the APIs we need to support.