[php-di v7] Optimize compiled factory definitions

[partikus]

Version compatible with PHP ^8.0 as a successor of #6

Details (copied from #6)

• compile final function with injected dependencies
• only for closure factories for now (as the first step)

1. Simple example:
   before:

return $this->resolveFactory(static function () {
    return 'bar';
}, 'factory');

now:

return (static function () {
    return 'bar';
})();

2. More complex example:
   before:

return $this->resolveFactory(static function (\DI\Factory\RequestedEntry $entry, \DI\Container $c, $dbName = null) {
    $parts = explode('.', $entry->getName());
    $type = $parts[1];
    if ($dbName === null && isset($parts[2])) {
        $dbName = $parts[2] !== '0' ? $parts[2] : false;
    }
    $factory = $c->get(\CMS\Database\ConnectionFactory::class);
    return $factory->create($type, $dbName);
}, 'db.mysql', [
            'dbName' => NULL,
        ]);

now:

return (static function (\DI\Factory\RequestedEntry $entry, \DI\Container $c, $dbName = null) {
    $parts = explode('.', $entry->getName());
    $type = $parts[1];
    if ($dbName === null && isset($parts[2])) {
        $dbName = $parts[2] !== '0' ? $parts[2] : false;
    }
    $factory = $c->get(\CMS\Database\ConnectionFactory::class);
    return $factory->create($type, $dbName);
})(new DI\Compiler\RequestedEntryHolder('db.mysql'), $this->get5cc4bd5c6dc8e808068072(), NULL);