feat: add Rust code in queue.md and deque.md (#757)

* feat: add Rust code in queue.md

* feat: add Rust code in deque.md

* style: fix comment style

docs/chapter_stack_and_queue/deque.md

@@ -301,7 +301,33 @@
 === "Rust"
 
     ```rust title="deque.rs"
+    /* 初始化双向队列 */
+    let mut deque: VecDeque<u32> = VecDeque::new();
 
+    /* 元素入队 */
+    deque.push_back(2);  // 添加至队尾
+    deque.push_back(5);
+    deque.push_back(4);
+    deque.push_front(3); // 添加至队首
+    deque.push_front(1);
+
+    /* 访问元素 */
+    if let Some(front) = deque.front() { // 队首元素
+    }
+    if let Some(rear) = deque.back() {   // 队尾元素
+    }
+
+    /* 元素出队 */
+    if let Some(pop_front) = deque.pop_front() { // 队首元素出队
+    }
+    if let Some(pop_rear) = deque.pop_back() {   // 队尾元素出队
+    }
+
+    /* 获取双向队列的长度 */
+    let size = deque.len();
+
+    /* 判断双向队列是否为空 */
+    let is_empty = deque.is_empty();
     ```
 
 === "C"