Add new regex validator - SigmahqUnsupportedRegexGroupConstruct

[nasbench]

This PR adds SigmahqUnsupportedRegexGroupConstruct validator in order to check if a rule using the re modifier is using an unsupported group construct such as a negative lookahead. Such constructs are currently unsupported by multiple language such as rust and golang.

[nasbench]

@thomaspatzke if you also could please provide feedback on this PR (as you are more versed in regex), that would be much appreciated.

[frack113]

LGTM

[thomaspatzke]

Good one! Perhaps we should even be more strict, turn it around and allowlist regular expression patterns instead of disallowing, as there might be further constructs that could be problematic constructs like (?(id)yes|no). Anyways, the current approach already should catch commonly used REs.