Add a destination_types endpoint which can list cached rates, required fields, etc.

[jklein24]

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[jklein24]

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This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
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• Add a destination_types endpoint which can list cached rates, required fields, etc. #118 👈 (View in Graphite)
• Add a spec for destination resolution #117
• main

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