Feat Support chat completion response format and seed new fields (#525)

* feat: support chat completion response format

* fix linting error

* fix

* fix linting

* Revert "fix linting"

This reverts commit 015c6ad62aad561218b693225f58670b5619dba8.

* Revert "fix"

This reverts commit 7b2ffe28c3e586b629d23479ec1728bf52f0c66f.

* Revert "fix linting error"

This reverts commit 29960423784e296cb6d22c5db8f8ccf00cac59fd.

* chore: add seed new parameter

* fix

chat.go

@@ -69,6 +69,17 @@ type FunctionCall struct {
 	Arguments string `json:"arguments,omitempty"`
 }
 
+type ChatCompletionResponseFormatType string
+
+const (
+	ChatCompletionResponseFormatTypeJSONObject ChatCompletionResponseFormatType = "json_object"
+	ChatCompletionResponseFormatTypeText       ChatCompletionResponseFormatType = "text"
+)
+
+type ChatCompletionResponseFormat struct {
+	Type ChatCompletionResponseFormatType `json:"type"`
+}
+
 // ChatCompletionRequest represents a request structure for chat completion API.
 type ChatCompletionRequest struct {
 	Model            string                       `json:"model"`
@@ -80,6 +91,8 @@ type ChatCompletionRequest struct {
 	Stream           bool                         `json:"stream,omitempty"`
 	Stop             []string                     `json:"stop,omitempty"`
 	PresencePenalty  float32                      `json:"presence_penalty,omitempty"`
+	ResponseFormat   ChatCompletionResponseFormat `json:"response_format,omitempty"`
+	Seed             *int                         `json:"seed,omitempty"`
 	FrequencyPenalty float32                      `json:"frequency_penalty,omitempty"`
 	// LogitBias is must be a token id string (specified by their token ID in the tokenizer), not a word string.
 	// incorrect: `"logit_bias":{"You": 6}`, correct: `"logit_bias":{"1639": 6}`