Support removeparam regexes

`removeparam` regex rules are relatively uncommon, and should be avoided by filter list authors because of the performance implications of using regexes. However, in some cases they are unavoidable, and so they should be supported.

They were left out of [the original `removeparam` implementation](https://github.com/brave/adblock-rust/pull/235) in an attempt to get the majority of the feature released earlier. In particular, uBlock Origin's `removeparam` implementation requires [a special `no-op` feature](https://github.com/gorhill/uBlock/wiki/Static-filter-syntax#_-aka-noop) to prevent ambiguity when parsing. It's also worth reviewing the regex features supported by JS regexes vs. Rust regexes to minimize compatibility differences.