Add an OpenAPI 3 Serializer

[kylef]

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Initial proof of concept with numerous caveats and unsupported elements (tracked in STATUS.md).

• [ ] Add smoke test for fury-cli

[BenFradet]

Hey :wave: , might I ask what's the status of this PR? Thank you :+1:

[kylef]

Hey wave , might I ask what's the status of this PR? Thank you +1

This is more of a proof of concept, I'm not sure we'll pursue this any further.