Add Strings.compare

[0xCaso]

Hi! I'd like to propose the addition of the new method compare for Strings, which would make things more elegant and make the code less repetitive. Also, it should be really useful for testing purposes with Foundry.

I'm referring to this (old) issue: https://github.com/OpenZeppelin/openzeppelin-contracts/issues/1795#issuecomment-1286701350

PR Checklist

• [x] Tests
• [x] Documentation
• [x] Changelog entry

[Amxx]

Note: I'd love #3666 to be merge first, so that the tests can use the new syntax (instead of having to update #3666 yet again)

[0xCaso]

What's the state of #3666? @Amxx

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