Add HTTPS Support to openai extension

[chuyqa]

Checklist:

• I have read the Contributing guidelines.

Related Issue: #4254

This PR passes the ssl-certfile and ssl-keyfile from the CLI to the OpenAI extension.

Test with no cert params

2023-10-12 09:08:15 INFO:Loading the extension "gallery"...
Running on local URL:  http://playground.internal:7860

To create a public link, set `share=True` in `launch()`.
OpenAI compatible API ready at: OPENAI_API_BASE=http://0.0.0.0:5001/v1

Test with cli args

# Same arguments from text-gen now get pushed down to the extension
...
--ssl-certfile=/devcerts/certificate.pem \
--ssl-keyfile=/devcerts/private_key.pem \
...

To create a public link, set `share=True` in `launch()`.
OpenAI compatible API ready at: OPENAI_API_BASE=https://0.0.0.0:5001/v1

Test with Env Variables

# Same naming convention OPENEDAI* as existing extension
export OPENEDAI_CERT_PATH=/devcerts/certificate.pem
export OPENEDAI_KEY_PATH=/devcerts/private_key.pem 
...
To create a public link, set `share=True` in `launch()`.
OpenAI compatible API ready at: OPENAI_API_BASE=https://0.0.0.0:5001/v1

[oobabooga]

Very nice, thank you!