Implement array shapes for `Preg::match` $matches by-ref parameter

[staabm]

as requested in https://github.com/phpstan/phpstan-src/pull/2589#issuecomment-2118794734

and further planned with https://github.com/phpstan/phpstan-src/pull/2589#issuecomment-2182124014

[Seldaek]

I won't have time to look in depth at this for a while but just wanted to say thanks already for even looking at doing it 🙏🏻