Handle add args to Non OpenAI models

[ishaan-jaff]

for ex if user makes a call

response = completion(
    model='command-nightly'
    messages=messages,
    max_tokens=self.config['max_tokens'],
    temperature=self.config['temperature'],
    top_p=self.config['top_p'],
    request_timeout=self.config['request_timeout'],
)

this could potentially fail, ensure it does not

[ishaan-jaff]

fixed !