Moved some elements in Common module to more proper locations

module/Integrations/config/dependencies.config.php

@@ -0,0 +1,16 @@
+<?php
+declare(strict_types=1);
+
+namespace Shlinkio\Shlink\Integrations;
+
+use Zend\Expressive\Router\Middleware\ImplicitOptionsMiddleware;
+
+return [
+
+    'dependencies' => [
+        'factories' => [
+            ImplicitOptionsMiddleware::class => Middleware\EmptyResponseImplicitOptionsMiddlewareFactory::class,
+        ],
+    ],
+
+];

module/Integrations/src/ConfigProvider.php

@@ -0,0 +1,14 @@
+<?php
+declare(strict_types=1);
+
+namespace Shlinkio\Shlink\Integrations;
+
+use function Shlinkio\Shlink\Common\loadConfigFromGlob;
+
+class ConfigProvider
+{
+    public function __invoke()
+    {
+        return loadConfigFromGlob(__DIR__ . '/../config/{,*.}config.php');
+    }
+}

module/Integrations/src/Middleware/EmptyResponseImplicitOptionsMiddlewareFactory.php

@@ -0,0 +1,17 @@
+<?php
+declare(strict_types=1);
+
+namespace Shlinkio\Shlink\Integrations\Middleware;
+
+use Zend\Diactoros\Response\EmptyResponse;
+use Zend\Expressive\Router\Middleware\ImplicitOptionsMiddleware;
+
+class EmptyResponseImplicitOptionsMiddlewareFactory
+{
+    public function __invoke()
+    {
+        return new ImplicitOptionsMiddleware(function () {
+            return new EmptyResponse();
+        });
+    }
+}

module/Integrations/test/Middleware/EmptyResponseImplicitOptionsMiddlewareFactoryTest.php

@@ -0,0 +1,39 @@
+<?php
+declare(strict_types=1);
+
+namespace ShlinkioTest\Shlink\Integrations\Middleware;
+
+use PHPUnit\Framework\TestCase;
+use ReflectionObject;
+use Shlinkio\Shlink\Integrations\Middleware\EmptyResponseImplicitOptionsMiddlewareFactory;
+use Zend\Diactoros\Response\EmptyResponse;
+use Zend\Expressive\Router\Middleware\ImplicitOptionsMiddleware;
+
+class EmptyResponseImplicitOptionsMiddlewareFactoryTest extends TestCase
+{
+    /** @var EmptyResponseImplicitOptionsMiddlewareFactory */
+    private $factory;
+
+    public function setUp(): void
+    {
+        $this->factory = new EmptyResponseImplicitOptionsMiddlewareFactory();
+    }
+
+    /** @test */
+    public function serviceIsCreated(): void
+    {
+        $instance = ($this->factory)();
+        $this->assertInstanceOf(ImplicitOptionsMiddleware::class, $instance);
+    }
+
+    /** @test */
+    public function responsePrototypeIsEmptyResponse(): void
+    {
+        $instance = ($this->factory)();
+
+        $ref = new ReflectionObject($instance);
+        $prop = $ref->getProperty('responseFactory');
+        $prop->setAccessible(true);
+        $this->assertInstanceOf(EmptyResponse::class, $prop->getValue($instance)());
+    }
+}