fix(go): modify interface of stack, queue and deque

codes/go/chapter_stack_and_queue/queue.go

@@ -6,13 +6,15 @@ package chapter_stack_and_queue
 
 type Queue interface {
 	// Offer 元素入队
-	Offer(num int)
+	Offer(num any)
 	// Peek 访问首元素
-	Peek() int
+	Peek() any
 	// Poll 元素出队
-	Poll() int
+	Poll() any
 	// Size 获取队列长度
 	Size() int
 	// IsEmpty 队列是否为空
 	IsEmpty() bool
+	// toString 队列输出为字符串
+	toString() string
 }