Add Palindromic Number to Swift

[KaalidArare]

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Please fill one of the sections below as applicable. Please also add any other relevant information to the Notes section at the bottom. You may delete or just ignore any other sections. For more information please refer to our contributing documentation

I Am Adding a New Code Snippet in an Existing Language

• [x] I fixed #4041
• [x] I named the pull request using Add {PROJECT} in {LANGUAGE} format

[github-advanced-security[bot]]

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