Get chat completions from a news-infused AI assistant

Get the chat completions for a given user message. This endpoint follows the OpenAI API spec. It includes a couple extra params, which include:

• journalist_mode: Whether to activate an auto prompt that is more keen on AP styling, citations, and fair reporting. Setting to false, you get a vanilla LLM with the news pre added to the system prompt. No other prompting.
• inline_citations: Decides how you want the bot to cite sources. It can use brackets, or it can also include the markdown with URL automatically.
• asknews_watermark: Whether to include the AskNews watermark in the response.