feat: Initial Classes and Interface for Transfer Manager

[sydney-munro]

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Fixes #<issue_number_goes_here> ☕️

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[BenWhitehead]

A few minor things to change, and a question or two.

[BenWhitehead]

TODO: validate either outputDestination or exception are non-null relative to the value of status.

[sydney-munro]

I will add this in a follow up. I know its only a few lines but was trying to get through the other comments first.

[BenWhitehead]

Thoughts on changing this to maxTotalBufferSize which could leave us wiggle room on how much per worker we use if we're able to determine scaling up buffer size can increase throughput.

[sydney-munro]

I feel like we are moving further from the original design which was chunkSize if we continue in this direction. I don't think this is necessarily a bad thing but node and python are also out already with chunkSize.