Enable multiple choices for tab /completions endpoint.

[ELigoP]

Validations

• [x] I believe this is a way to improve. I'll try to join the Continue Discord for questions
• [x] I'm not able to find an open issue that requests the same enhancement

Problem

When I hover over proposed completion, I always see 1/1. It is very useful and improves productivity when you don't like the first completion and have several choices how to complete. I've read https://docs.continue.dev/reference , haven't found suitable config option.

Solution

I think completionOptions is suitable for this, and OpenAI API corresponding field is https://platform.openai.com/docs/api-reference/completions/create#completions-create-n ( How many completions to generate for each prompt. ).