Implement PregMatchAllParameterOutTypeExtension

[staabm]

Starting in small steps, as I think preg_match_all has some edge-cases each worth a separate PR ;)

[staabm]

for a green build this PR requires #3257

[Seldaek]

Nice! Doesn't look like too much code so far, which is also what I expected. The return type is different because it's an array of arrays of matches, but otherwise the big chunk of the pattern extraction etc is the same really.

[ondrejmirtes]

1. All the flags described here https://www.php.net/manual/en/function.preg-match-all.php need implementation and tests.
2. We also need TypeSpecifyingExtension for code like:

• if (preg_match_all($x, $y, $z))
• if (preg_match_all($x, $y, $z) > 0)
• if (preg_match_all($x, $y, $z) != false) (loose != on purpose)
• if (preg_match_all($x, $y, $z) == true) (two == on purpose)
• if (preg_match_all($x, $y, $z) === 1) (any number higher than 0)
• Falsy contexts of all of the above

[ondrejmirtes]

I'm also looking forward to https://www.php.net/manual/en/function.preg-replace-callback.php because I believe that's going to take advantage of the new-ish FunctionParameterClosureTypeExtension :)

[phpstan-bot]

This pull request has been marked as ready for review.

[staabm]

I think I am at a point where I don't see any mistakes anymore, because I am so deep into it.
lets see what you gyus think about it

[ondrejmirtes]

Thank you.