Add a cli flag to take the http logging file name (optional). This file name should be passed all the way to the chat completion streamer and use to log LLM requets. Remove the use the DEBUG environment variable, and instead just check that the filename is availab.e

Add a cli flag to take the http logging file name (optional). This file name should be passed all the way to the chat completion streamer and use to log LLM requets. Remove the use the DEBUG environment variable, and instead just check that the filename is availab.e #1