ref: add image url support to messages (#933)

* ref: add image url support to messages

* fix linter error

* fix linter error

Author: mazyaryousefinia

messages.go

@@ -41,6 +41,7 @@ type MessageContent struct {
 	Type      string       `json:"type"`
 	Text      *MessageText `json:"text,omitempty"`
 	ImageFile *ImageFile   `json:"image_file,omitempty"`
+	ImageURL  *ImageURL    `json:"image_url,omitempty"`
 }
 type MessageText struct {
 	Value       string `json:"value"`
@@ -51,6 +52,11 @@ type ImageFile struct {
 	FileID string `json:"file_id"`
 }
 
+type ImageURL struct {
+	URL    string `json:"url"`
+	Detail string `json:"detail"`
+}
+
 type MessageRequest struct {
 	Role        string             `json:"role"`
 	Content     string             `json:"content"`