Update ChatCompletionChoice with optional finish_reason and finish_details

src/v1/chat_completion.rs

@@ -119,7 +119,8 @@ pub struct ChatCompletionMessageForResponse {
 pub struct ChatCompletionChoice {
     pub index: i64,
     pub message: ChatCompletionMessageForResponse,
-    pub finish_reason: FinishReason,
+    pub finish_reason: Option<FinishReason>,
+    pub finish_details: Option<FinishDetails>,
 }
 
 #[derive(Debug, Deserialize)]
@@ -187,6 +188,13 @@ pub enum FinishReason {
     null,
 }
 
+#[derive(Debug, Serialize, Deserialize)]
+#[allow(non_camel_case_types)]
+pub struct FinishDetails {
+    pub r#type: FinishReason,
+    pub stop: String,
+}
+
 #[derive(Debug, Serialize, Deserialize, Clone)]
 pub struct FunctionCall {
     #[serde(skip_serializing_if = "Option::is_none")]