OpenAI wrapper should warn on fallback wrapper

[kcarnold]

We had code that was using openai.chat.completions.parse (notice, not .beta). This was silently hitting the fallback __getattr__ in the OpenAI wrappers (e.g.,

posthog-python/posthog/ai/openai/openai_async.py

Line 82 in b3ebea2

return getattr(self._original, name)

and similar patterns throughout that file). That meant that we were at best not logging those endpoints, and at worst crashing when we were trying to pass posthog_distinct_id etc. to it.

I'm not sure what the right behavior is, but the silent fallback bit us and led to crashes.

(Should I open a second bug for openai.chat.completions.parse not being wrapped?)

[marandaneto]

@PostHog/team-ai-observability

[marandaneto]

#618