feat: rewrite ImageMagickHandler to rely solely on the PHP imagick extension

[michalsn]

Description
This PR rewrites ImageMagickHandler to rely solely on the PHP imagick extension.

Since we required this extension from the beginning, there should be no problems for users.

Fixes #9512

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[paulbalandan]

Would this fix #6149 ? Or performance is still somehow the same?

[michalsn]

Yes, it should be better. Using the imagick extension can actually be faster than CLI in many cases because we load and manipulate images entirely in memory.

This may not be true only for very large files.

It would be great if someone with a real-world use case could check this out.

[michalsn]

I ran some tests with a PNG image that was 6.7 MB in size.

$iterator = new \CodeIgniter\Debug\Iterator();
$iterator->add('imagick', static function () {
    service('image', 'imagick')
        ->withFile(WRITEPATH . '/test/mypic.png')
        ->flip()
        ->resize(500, 500, true)
        ->text('Copyright 2025 My Photo Co', [
            'color' => '#fff',
            'opacity' => 0.5,
            'withShadow' => true,
            'hAlign' => 'center',
            'vAlign' => 'bottom',
            'fontSize' => 20,
            'padding' => 20,
        ])
        ->save(WRITEPATH . '/test/image.jpg');
});

return $iterator->run(10);

Version	Time (seconds)
Old version	79.5258
New version	1.8617

[michalsn]

Thank you for the review @paulbalandan, and everyone else for the feedback.