Add Strings.equal

[0xCaso]

Hi! I'd like to propose the addition of the new method equal 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: #1795 (comment)

PR Checklist

• Tests
• Documentation
• 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

[frangio]

LGTM

[ernestognw]

LGTM.

I'd like to explorer further if there's a cheaper way of doing this since keccak is an expensive operation.

I don't think it's worth it at the moment but mentioning for the record.

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