support new openai package

[sonichi]

openai/openai-python#631

Tasks

Beta Give feedback

1. openai.api_base -> openai.base_url #384
   +0
2. openai.InvalidRequestError -> openai.BadRequestError #385
   +0
3. openai.ChatCompletion.create() -> client.chat.completions.create() #386
   2 of 2
   dependencies +1
4. openai.Completion.create() -> client.completions.create() #387
   +0
5. remove openai.api_key_path #388
   +0
6. remove openai.api_version
7. remove openai.api_type
8. support aoai
9. Response objects are now pydantic models and no longer conform to the dictionary shape.
10. headsup about dependency change
11. openai.error.* -> openai.*; remove ServiceUnavailableError #402
    +0
12. merge to main
13. support the old way of logging? #442
    dependencies +1
14. add back the test for teachable agent #450
    teach +1
    
15. add back the test for retrieve chat #451
    +0
    
16. write a migration guide #476
    +0
17. update notebooks for retrieve chat #552
    dependencies documentation rag +3
18. update required notebooks examples #553
    dependencies documentation +2

[sonichi]

I'm about to get started on this issue. Suggestions and code reviews are welcome.