Add OpenAI assistant integration

[constantinidan]

Create a method to log threads, runs of OpenAI Assistants. Check https://platform.openai.com/docs/assistants/overview.
Thread API: https://docs.literalai.com/python-client/api-reference/thread
Step API: https://docs.literalai.com/python-client/api-reference/step (steps can be step, runs, messages)
Generation API: https://docs.literalai.com/python-client/api-reference/api#create-generation

# pull the OAI assistant thread

with literalai_client.thread() as thread:
      for run in runs:
            for step in run:
                   # log steps
      for message in messages_from_openai_thread:
           # log message in literalai

Example here: https://github.com/Chainlit/literalai-typescript/blob/main/src/instrumentation/openai-syncer.ts