Add a new rule for detecting regexps vulnerable to ReDoS

[#13 comment 1589006534](https://github.com/AdguardTeam/AGLint/issues/13#issuecomment-1589006534)

[#13 comment 1631258759](https://github.com/AdguardTeam/AGLint/issues/13#issuecomment-1631258759)

We should check https://github.com/tjenkinson/redos-detector

Keep in mind that regexps can occur in several places, e.g. as network rule patterns, modifier values, scriptlet parameters

Start by reading the two linked comments on issue #13 and reviewing the redos-detector project. Then trace how AGLint represents network rule patterns, modifier values, and scriptlet parameters; done means the new rule reliably detects vulnerable regexps in each applicable location.

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