Update llm_monitors to work with openai>=1.0.0

[gustavocidornelas]

Summary

• openai>=1.0.0 has a different Python API (discussion). Instead of openai.ChatCompletions.create, for example, the method of interest is:

from openai import OpenAI
client = OpenAI()
client.chat.completions.create(...)

• I've updated the llm_monitors to work with both versions. This is done by checking the openai.__version__ and monkey-patching the correct method depending on the case.
• The notebook example was also updated. I added comments indicating how the monitors work for each openai version.