[Config][DependencyInjection] Add configuration builder for writing PHP config

Author: Nyholm

Kernel.php

@@ -13,6 +13,7 @@
 
 use Symfony\Bridge\ProxyManager\LazyProxy\Instantiator\RuntimeInstantiator;
 use Symfony\Bridge\ProxyManager\LazyProxy\PhpDumper\ProxyDumper;
+use Symfony\Component\Config\Builder\ConfigBuilderGenerator;
 use Symfony\Component\Config\ConfigCache;
 use Symfony\Component\Config\Loader\DelegatingLoader;
 use Symfony\Component\Config\Loader\LoaderResolver;
@@ -758,7 +759,7 @@ protected function getContainerLoader(ContainerInterface $container)
             new XmlFileLoader($container, $locator, $env),
             new YamlFileLoader($container, $locator, $env),
             new IniFileLoader($container, $locator, $env),
-            new PhpFileLoader($container, $locator, $env),
+            new PhpFileLoader($container, $locator, $env, class_exists(ConfigBuilderGenerator::class) ? new ConfigBuilderGenerator($this->getBuildDir()) : null),
             new GlobFileLoader($container, $locator, $env),
             new DirectoryLoader($container, $locator, $env),
             new ClosureLoader($container, $env),