Check if anthropic and open AI instrumentations set `gen_ai.request.top_k` and `gen_ai.request.choice.count` sem convs

[DylanRussell]

Check out https://github.com/open-telemetry/semantic-conventions-genai/blob/main/docs/gen-ai/gen-ai-spans.md for what these are.

These were missing from the GenAi util inference invocation so might have been missed entirely.. I'm adding them in #119