Add regexp/require-unicode-sets-regexp rule

[ota-meshi]

close #582

[changeset-bot]

🦋 Changeset detected

Latest commit: 3757a92

The changes in this PR will be included in the next version bump.

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Name	Type
eslint-plugin-regexp	Minor

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[RunDevelopment]

The compatibility check isn't enough, because the v might cause the regex to be parsed differently. E.g. /[a&&b]/u. Of course, edge cases like this are going to be extremely rare, since e.g. [a&&b] doesn't make sense without the v flag.

Fixing this should be relatively easy. We just to verify that no character classes in the u regex contain any double punctuation sequences in their raw source code.

[ota-meshi]

Thank you for checking this PR. I fixed the problem. Could you please check again?