Add "citations" to chatCompletion response for access to and use with Perplexity api

[stardomains3]

https://docs.perplexity.ai/api-reference/chat-completions

"citations
any[]"

I guess it is a list

@serializable
public final data class ChatCompletion(
@SerialName(value = "id")
public final val id: String,
@SerialName(value = "created")
public final val created: Long,
@SerialName(value = "model")
public final val model: ModelId,
@SerialName(value = "choices")
public final val choices: List,
@SerialName(value = "usage")
public final val usage: Usage? = null,
@SerialName(value = "system_fingerprint")
public final val systemFingerprint: String? = null
)