Upgrade error reporting for streams

[sashabaranov]

It would be nice to have improved error reporting for streams (based on #68)

[sheikbasha9176]

Hi I would like to work on this and submit a PR later

[woody712]

I also have this requirement.

[vvatanabe]

Related Topic: https://community.openai.com/t/chatgpt-turbo-streaming-always-ends-in-error/83522/5

Sample:

data: {“error”:{“message”:“The server had an error processing your request. Sorry about that! You can retry your request, or contact us through our help center at [help.openai.com 1](http://help.openai.com/) if you keep seeing this error. (Please include the request ID fb94b183e8b7bc5aca22fa62981cc107 in your email.)”,“type”:“server_error”,“param”:null,“code”:null}}

Formatted:

{
    “error”: {
        “message”: “The server had an error processing your request. Sorry about that! You can retry your request, or contact us through our help center at help.openai.com 1 if you keep seeing this error. (Please include the request ID fb94b183e8b7bc5aca22fa62981cc107 in your email.)”,
        “type”:“server_error”,
        “param”:null,
        “code”:null
    }
}

[vvatanabe]

Fixed #396