feat(UnusedParameterSniff): support supression via parameter name

[claytonrcarter]

Hi 👋

It's common to have unused method params, especially in cases where you're extending and overriding a method from a parent class. Instead of sprinkling // phpcs:ignore SlevomatCodingStandard.Functions.UnusedParameter.UnusedParameter thoughout my code, I'd prefer to just rename those variables to $_variable. This is similar to how eslint and Rust's clippy handle unused params, and I've found those to be convenient and still helpful.

My only TODO is maybe putting this behind a config flag, but I didn't want to get into that until I heard if this change is desired at all. This is my first contribution here, and no AI was used in this.

This sort of addresses #1074, and it may even close it.

[kukulich]

I'm ok to merge such feature but I would prefer to make it configurable via new option. The option should probably contain regexp.

[claytonrcarter]

OK, I've updated this based on forbiddenCommentPatterns in ForbiddenCommentsSniff. Does this look OK to you? If so, I can make the test more robust. (Right now it's only testing patterns /a/ and /b/ against $a and $b, but it should probably check for something more "patterny". 😄 )