feat(hydrator): add sourceHydrator types

[crenshaw-dev]

I'm breaking the hydrator into separate PRs. This is party to make them easier to review, partly because the commit history on the original PR is pretty messy at this point.

This PR just has the new types, i.e. the API, so that it can be reviewed on its own.

I've added everyone who helped as a co-author on this PR.

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Please upload report for BASE (master@030a7be). Learn more about missing BASE report. Report is 449 commits behind head on master.

Additional details and impacted files

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  Coverage          ?   53.41%           
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  Files             ?      324           
  Lines             ?    55649           
  Branches          ?        0           
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  Hits              ?    29723           
  Misses            ?    23317           
  Partials          ?     2609           

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[crenshaw-dev]

Parent PR was merged.