feat: add default for mapping.paths

Author: alanpoulain

src/Symfony/Bundle/DependencyInjection/Configuration.php

@@ -129,6 +129,7 @@ public function getConfigTreeBuilder(): TreeBuilder
                     ->addDefaultsIfNotSet()
                     ->children()
                         ->arrayNode('paths')
+                            ->defaultValue(['%kernel.project_dir%/src/ApiResource', '%kernel.project_dir%/src/Entity'])
                             ->prototype('scalar')->end()
                         ->end()
                     ->end()

tests/Symfony/Bundle/DependencyInjection/ConfigurationTest.php

@@ -167,7 +167,10 @@ private function runDefaultConfigTests(array $doctrineIntegrationsToLoad = ['orm
                 ],
             ],
             'mapping' => [
-                'paths' => [],
+                'paths' => [
+                    '%kernel.project_dir%/src/ApiResource',
+                    '%kernel.project_dir%/src/Entity',
+                ],
             ],
             'http_cache' => [
                 'invalidation' => [