Add Parameters to Enable OpenAI Summarization of Diff Contents

[ezraschwaa]

Adds new parameters that the post_webhook function will check which are:

• openai_api_key: OpenAI API key for generating diff summaries

• openai_model (optional): OpenAI preferred model for generating diff summaries. Defaults to "gpt-4o"

• openai_prompt (optional): Custom OpenAI prompt for generating diff summaries

New usage example:

production:
  server: www.example.com
  webhook_url: http://api.example.com/frak/frak.php
  openai_api_key: sk-example
  openai_model: gpt-3.5-turbo
  openai_prompt: Summarize this diff content in the form of a poem!