Created new Installer module and moved everything from CLI there

module/Installer/src/Factory/InstallApplicationFactory.php

@@ -0,0 +1,57 @@
+<?php
+declare(strict_types=1);
+
+namespace Shlinkio\Shlink\Installer\Factory;
+
+use Interop\Container\ContainerInterface;
+use Interop\Container\Exception\ContainerException;
+use Shlinkio\Shlink\Installer\Command\InstallCommand;
+use Shlinkio\Shlink\Installer\Config\ConfigCustomizerManager;
+use Shlinkio\Shlink\Installer\Config\Plugin;
+use Symfony\Component\Console\Application;
+use Symfony\Component\Console\Exception\LogicException;
+use Symfony\Component\Filesystem\Filesystem;
+use Zend\Config\Writer\PhpArray;
+use Zend\ServiceManager\AbstractFactory\ConfigAbstractFactory;
+use Zend\ServiceManager\Exception\ServiceNotCreatedException;
+use Zend\ServiceManager\Exception\ServiceNotFoundException;
+use Zend\ServiceManager\Factory\FactoryInterface;
+use Zend\ServiceManager\Factory\InvokableFactory;
+
+class InstallApplicationFactory implements FactoryInterface
+{
+    /**
+     * Create an object
+     *
+     * @param  ContainerInterface $container
+     * @param  string $requestedName
+     * @param  null|array $options
+     * @return object
+     * @throws LogicException
+     * @throws ServiceNotFoundException if unable to resolve the service.
+     * @throws ServiceNotCreatedException if an exception is raised when
+     *     creating a service.
+     * @throws ContainerException if any other error occurs
+     */
+    public function __invoke(ContainerInterface $container, $requestedName, array $options = null)
+    {
+        $isUpdate = $options !== null && isset($options['isUpdate']) ? (bool) $options['isUpdate'] : false;
+
+        $app = new Application();
+        $command = new InstallCommand(
+            new PhpArray(),
+            $container->get(Filesystem::class),
+            new ConfigCustomizerManager($container, ['factories' => [
+                Plugin\DatabaseConfigCustomizer::class => ConfigAbstractFactory::class,
+                Plugin\UrlShortenerConfigCustomizer::class => InvokableFactory::class,
+                Plugin\LanguageConfigCustomizer::class => InvokableFactory::class,
+                Plugin\ApplicationConfigCustomizer::class => InvokableFactory::class,
+            ]]),
+            $isUpdate
+        );
+        $app->add($command);
+        $app->setDefaultCommand($command->getName(), true);
+
+        return $app;
+    }
+}