Create OpenAI function that categorizes posts

[jifonthespoon]

Create a function that queries OpenAI with a post's question and response options that returns a [String] list of the categories that Post belongs to. The categories should ONLY be from the Category enum. The list of categories needs passed within the OpenAI query in addition to the post information. You should iterate the Category enum to provide the categories, not hard code. Ensure the returned categories exist in the Category enum. Use model gpt-4o-mini