Add TransactWriteItems

[ryanblock]

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[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
1 out of 4 committers have signed the CLA.

:white_check_mark: ryanblock
:x: n0286293
:x: tume
:x: jpeterschmidt

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[jpshack-at-palomar]

@ryanblock What is the must fix here to get this merged? If we are just a few hours of work away I'd be happy pitch in.

[ryanblock]

@jpshack-at-palomar please read my comments above; this PR has fundamental issues with how continuation passing works, and it cannot be merged in its current state. As a programmer, I do not feel confident making claims that anything is a few hours of work away, let alone something as complex as this.

I was hoping the author would help us get this PR into shape, but since we haven't heard back my plan has been to hopefully snag a few bits here and there, but probably rewrite. As ever, I'd be happy for someone in the community to start work on a fresh PR.