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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Setting up the constraints took about 30 lines of SQL just for those couple of boolean fields on some of the categories, you can see the details here [2].
As far as making this a Postgres extension - I'm not sure how useful it would be when the application language doesn't have a notion of sum types. Thinking about it, what might be more useful would be a language-specific library for data validation/constraints that sets up the database constraints as well. I'm not sure, though.
[1] We weren't using Rust, this was in Go, but I figured this was the most succinct way to summarize it. Our GraphQL schema for this type was basically the equivalent of this.
[2] https://github.com/CMSgov/easi-app/blob/main/migrations/V164...