Feature: Add support for namespaced typescript interfaces

[gerbal]

This PR adds support for TypeScript namespaces to resolve grantila/typeconv#10

Namespaces are prepended to interfaces names like "namespace.interface". This does not add support for adding namespaces back to typescript.

[grantila]

Thanks! This is a bit tricky, there is no "namespace" support in GraphQL or JSON Schema, so this would produce code that wouldn't work on other platforms, well, maybe some JSON Schema consumers. "Foo.Bar" simply isn't a good name, that dot will produce problems. So we'd need to be able to configure how to handle namespaces, e.g:

• Using members in a namespace, but dropping the namespace name(s)
• Joining with . (as you did)
• Joining with _ which would produce valid code in both TypeScript and GraphQL

I'll take a look at this.

[github-actions]

🎉 This issue has been resolved in version 3.2.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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