New PHP 8.4 Syntax: Asymmetric visibility

https://wiki.php.net/rfc/asymmetric-visibility-v2

```php
class Foo
{
    PRIVATE(set) string $bar1 = '';
    public private(SET) string $bar2 = '';
    private(set) public string $bar3 = '';

    public function __construct(
        public protected(SET) string $bar4 = ''
    ) {}
}
```

See this working here: https://3v4l.org/JDXuq/rfc#vgit.master_jit