openai.realtime.RealtimeModel.withAzure inputAudioTranscription missing language

[Code](https://github.com/livekit/agents-js/blob/3b49909cc0e4288d87bb344010837bec97bdde66/plugins/openai/src/realtime/api_proto.ts#L103)

[Docs](https://learn.microsoft.com/en-us/azure/ai-foundry/openai/realtime-audio-reference#realtimeaudioinputtranscriptionsettings)

# Bug
- missing language
- missing prompt