Switch from v1/completions to v1/chat/completions

According to the [openai docs](https://platform.openai.com/docs/api-reference/completions) the completions endpoint is deprecated and chat/completions endpoint should be used instead. Are there plans for this migration? I’ve seen that edits endpoint is deprecated and will issue a deprecation warning in this plugin, however no such message exists for the completions endpoint. Or am I missing something?

Start with the OpenAI API reference linked in the issue and search the plugin for the v1/completions entry point. Confirm whether migration to v1/chat/completions is in scope, then define done as using the replacement endpoint without relying on the deprecated one.

Written by the indexing model from the issue text.