Implement support for OpenAPI Data Types

[dlcarter]

We should implement a type (or similar) attribute on fields that corresponds to the OpenAPI spec data types.

The benefits are numerous, but notably:

• We can more intelligently decide how to serialize primitives
• It can empower direct OpenAPI spec generation (re: https://github.com/procore/painted-rabbit/issues/21)

[max-did-it]

I did this as part of monkeypatch for work needs, if relevant I can make a pull request

[dlcarter]

That would be great!

[timbroder]

@max-did-it were you able to open one?

[github-actions[bot]]

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