WIP: insert pre- and post- actions in ios_xctestrun_runner
#2649
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Iterating on this out in the open. It's a proof of concept, but it does work. I'm not married to any aspect of this API, the fact that hooks have access to all environment variables the test runner does, nor the lack of a live log-parser hook in this implementation. I recommend maintainers be ruthless and specific in what they want out of this change.