text: Title: Additional open AI configuation options for editor AI chat and code completion
  Body: ### Description
  
  Adding gitlab issue as per discord conversation at https://discord.com/channels/1059888774789730424/1349354519284289536
  
  Setup config `.toml` to add additional optional keywords for httpx session that the openai python library uses under the hood for openAI compatible API/AI assistants that are secured with ssl/tls. Specifically, add in `verify` and `ssl_verify` as keywords for openai in config. See https://www.python-httpx.org/advanced/ssl/ for more examples/options. 
  
  ### Suggested solution
  
  Based on the discord conversation, it looks like that the changes could be made in:
  `marimo/_server/api/endpoints/ai.py`
  `marimo/_config/config.py`
  
  I am unsure if the openai client creation can directly be based these parameters or if an httpx_client object would have to be passed to the `http_client` parameter when calling 
  ```
  OpenAI(
              default_headers={"api-key": key},
              api_key=key,
              base_url=base_url,
          )
  ```
  
  ### Alternative
  
  _No response_
  
  ### Additional context
  
  I am uncertain if I will be able to make the pull request, due to some corporate rules we have to follow when contributing (formally at least) to open source projects. 