feat(kebabCase): Add kebabCase function

[bertyhell]

similar to: https://lodash.com/docs/4.17.15#kebabCase

Also adds more tests to snakeCase which revealed a bug for this case:

snakeCase('FOO_BAR'); // Would wrongly output: f_o_o_bar instead of the correct foo_bar

Usage:

import { kebabCase } from 'es-toolkit/string';

kebabCase('camelCase'); // returns 'camel-case'
kebabCase('some whitespace'); // returns 'some-whitespace'
kebabCase('hyphen-text'); // returns 'hyphen-text'
kebabCase('HTTPRequest'); // returns 'http-request'

[vercel]

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[haejunejung]

Oh, when I implemented snakeCase, so many typos! Thanks you for correcting the typos.

However, when writing the documetation for kabab case, I think that overwrite the documentation for snake case. Could you check about this?
(I think, /reference/string/snakeCase -> /reference/string/kebabCase

[raon0211]

Thanks for your contribution!