Add `openapi-fetch` to data fetching packages

[Greenheart]

This package is a very popular way to interact with APIs that publish OpenAPI or Swagger schemas.

This is useful for integrating third party APIs in a SvelteKit-app, and external APIs that are not built with SvelteKit. For example if you have a dedicated API built in another programming language and only use SvelteKit for the frontend.

https://www.npmjs.com/package/openapi-fetch

[benmccann]

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