Feature: Add support for Groq API key and models

[nerder]

As in title, since this is already using litellm, shouldn't be difficult to allow the use of Groq.

[wrongite]

@nerder Actually it already supports. I succeeded to configure it.

Try this.

DEFAULT_MODEL=llama3-8b-8192
API_BASE_URL=https://api.groq.com/openai/v1
OPENAI_USE_FUNCTIONS=false
OPENAI_API_KEY=[Your Groq API key here]

[sarojbelbase]

Please add support for the groq as well

[sjanaX01]

@sarojbelbase Follow #655 instruction