Review Swift codes (#1150)

* feat(swift): review for chapter_computational_complexity

* feat(swift): review for chapter_data_structure

* feat(swift): review for chapter_array_and_linkedlist

* feat(swift): review for chapter_stack_and_queue

* feat(swift): review for chapter_hashing

* feat(swift): review for chapter_tree

* feat(swift): add codes for heap article

* feat(swift): review for chapter_heap

* feat(swift): review for chapter_graph

* feat(swift): review for chapter_searching

* feat(swift): review for chapter_sorting

* feat(swift): review for chapter_divide_and_conquer

* feat(swift): review for chapter_backtracking

* feat(swift): review for chapter_dynamic_programming

* feat(swift): review for chapter_greedy

* feat(swift): review for utils

* feat(swift): update ci tool

* feat(swift): trailing closure

* feat(swift): array init

* feat(swift): map index

docs/chapter_heap/heap.md

@@ -270,7 +270,35 @@
 === "Swift"
 
     ```swift title="heap.swift"
-    // Swift 未提供内置 Heap 类
+    /* 初始化堆 */
+    // Swift 的 Heap 类型同时支持最大堆和最小堆，且需要引入 swift-collections
+    var heap = Heap<Int>()
+
+    /* 元素入堆 */
+    heap.insert(1)
+    heap.insert(3)
+    heap.insert(2)
+    heap.insert(5)
+    heap.insert(4)
+
+    /* 获取堆顶元素 */
+    var peek = heap.max()!
+
+    /* 堆顶元素出堆 */
+    peek = heap.removeMax() // 5
+    peek = heap.removeMax() // 4
+    peek = heap.removeMax() // 3
+    peek = heap.removeMax() // 2
+    peek = heap.removeMax() // 1
+
+    /* 获取堆大小 */
+    let size = heap.count
+
+    /* 判断堆是否为空 */
+    let isEmpty = heap.isEmpty
+
+    /* 输入列表并建堆 */
+    let heap2 = Heap([1, 3, 2, 5, 4])
     ```
 
 === "JS"