Allow manual deletion of temporary files

[darkons]

Currently temporary files are deleted via the __destruct method but this does not work when using PDFMerger through Laravel queues.

More info:
laravel/framework#18539

For this reason, it would be interesting to add a method that allows deleting temporary files manually for these use cases.

Something like this:

public function __destruct()
{
    $this->cleanup();
}

public function cleanup()
{
    $oFilesystem = $this->oFilesystem;
    $this->tmpFiles->each(function ($filePath) use ($oFilesystem) {
        $oFilesystem->delete($filePath);
    });
}

$pdfMerger = PDFMerger::init();
$pdfMerger->addPDF($path1, 'all');
$pdfMerger->addPDF($path2, 'all');
$pdfMerger->merge();
$pdfMerger->save('merged_result.pdf');
$pdfMerger->cleanup()

What do you think about this?