OpenAPI update for text-generation-webui

[kisimoff]

Update: OpenAPI Integration for text-generation-webui

This MR updates the evaluation script to use the OpenAI API with the text-generation-webui.

Workflow

• No changes in the preparation steps.

• To run the script interview-oobabooga.py, simply add the host flag and host:port used in ooba. Example:

  python interview-oobabooga.py --host 0.0.0.0:1234
  

  + the rest of the flags

[the-crypt-keeper]

@kisimoff Thanks for the PR! Could you rebase it and back out the README.md change? Then it's good to merge.