[language support] REST APIs

Scrape comments in code from any language to create API documentation. Try to match existing comment-based models like the following tools (or just integrate with them directly):

- [apiDoc](https://apidocjs.com/)

Might want to create OpenAPI definitions and/or Postman collections based on the scraped info

Start by reviewing Kodiak's existing wrappers around code documentation CLI tools and the JSON models they produce. Compare apiDoc's comment-based approach, then define which languages and output formats are in scope; done means documented support for the agreed inputs and generated API documentation, OpenAPI definitions, or Postman collections.

Written by the indexing model from the issue text.