Intgrate Vale into the Spectral Open API Spec linter

[alecthegeek]

This is an additional alternative to @jdkato's blog post on Vale and Open API specs.

(see https://medium.com/valelint/vale-the-openapi-specification-8a7cfae135fb)

I will write my approach up correctly in the next few weeks, but in the meantime I thought I share my rough notes

https://gitlab.com/-/snippets/3725162

It's a bit slow, but from my testing I don't think I can do much about that. It's the constraint of having to exec Vale for each text field in the spec file.