[php-src] Issue #22684: Reflection(Class)Constant::__toString() should print booleans as booleans

Issue: https://github.com/php/php-src/issues/22684
Author: DanielEScherzer

```php
<?php

echo new ReflectionConstant('true');
echo new ReflectionConstant('false');

class Demo {
    public const MY_TRUE = true;
    public const MY_FALSE = false;
    
    public $true = true;
    public $false = false;
}
echo new ReflectionClassConstant(Demo::class, 'MY_TRUE');
echo new ReflectionClassConstant(Demo::class, 'MY_FALSE');
echo new ReflectionProperty(Demo::class, 'true');
echo new ReflectionProperty(Demo::class, 'false');

function demo($t = true, $f = false) {}
echo new ReflectionFunction('demo');
```

shows:
```
Constant [ <persistent> bool TRUE ] { 1 }
Constant [ <persistent> bool FALSE ] {  }
Constant [ public bool MY_TRUE ] { 1 }
Constant [ public bool MY_FALSE ] {  }
Property [ public $true = true ]
Property [ public $false = false ]
Function [ <user> function demo ] {
  @@ /in/5nqGe 18 - 18

  - Parameters [2] {
    Parameter #0 [ <optional> $t = true ]
    Parameter #1 [ <optional> $f = false ]
  }
}
```

booleans in constants should be `true` or `false`, not `1` or (missing)
Marking as a feature request since this is a behavior change and shouldn't be applied to released versions