add chatcompletion stream delta refusal and logprobs

[Yu0u]

Describe the change Like #844, In ChatCompletionStream.delta the refusal and logprobs field is missing

Provide OpenAI documentation link Provide a relevant API doc from https://platform.openai.com/docs/api-reference

Describe your solution Add Refusal and Logprobs Fields

Tests n/a

Additional context n/a