feat: add Swift codes for chapter_sorting articles

[nuomi1]

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• I've tested the code and ensured the outputs are the same as the outputs of reference codes.
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1 Ignored Deployment

Name	Status	Preview	Comments	Updated
hello-algo	⬜️ Ignored (Inspect)			Jan 30, 2023 at 3:15PM (UTC)

[nuomi1]

result of `bubble_sort.swift`

冒泡排序完成后 nums = [1, 1, 2, 3, 4, 5]
冒泡排序完成后 nums1 = [1, 1, 2, 3, 4, 5]

result of `insertion_sort.swift`

插入排序完成后 nums = [1, 1, 2, 3, 4, 5]

result of `quick_sort.swift`

快速排序完成后 nums = [0, 1, 2, 3, 4, 5]
快速排序（中位基准数优化）完成后 nums1 = [0, 1, 2, 3, 4, 5]
快速排序（尾递归优化）完成后 nums2 = [0, 1, 2, 3, 4, 5]

result of `merge_sort.swift`

归并排序完成后 nums = [0, 1, 2, 3, 4, 5, 6, 7]

result of `radix_sort.swift`

基数排序完成后 nums = [3, 4, 12, 23, 192, 788]

[krahets]

I think we could use != instead so that we don't have to define the ^ operator for bool.

[nuomi1]

Done.

[krahets]

Awesome! Please address the comments.

[krahets]

Thanks!