feat(openai): introducing `KnownRealtimeResponse`

[jjangga0214]

Hi!

Type inference is not made smartly when using the type RealtimeResponse.

Let's take this snippet as a usage.

https://github.com/livekit-examples/realtime-playground/blob/989a7cb0edb517e4915e21305a041fa7da2aac37/agent/playground_agent.ts#L172-L209

For example, when response.status === "incomplete", response.statusDetails.reason should be asserted to 'turn_detected' | 'client_cancelled' | string;. But as you can see, it's not.

The error message is like this.

The same applies to other statuses such as "failed".

This PR exports new types including KnownRealtimeResponse, which resolves the issue.

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