[RFC]: add `@stdlib/assert/is-palindrome`

[TamimEhsan]

Description

This RFC proposes to add a new assert util to check if a string is palindrome or not.

Related Issues

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Questions

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Reference: Palindrome | Wikipedia

Checklist

• I have read and understood the Code of Conduct.
• Searched for existing issues and pull requests.
• The issue name begins with RFC:.

[stdlib-bot]

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[kgryte]

In your RFC, I suggest also including (a) the proposed package name, (b) example usage, and (c) any potential gotchas. E.g., how will you handle surrogate pairs and grapheme clusters?