DX: [dql] add a function JSON_EXTRACT

This might be used to sort lines which contains translatable string.

src/Bundle/ChillMainBundle/Tests/Doctrine/DQL/JsonExtractTest.php

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+<?php
+
+declare(strict_types=1);
+
+/*
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Doctrine\DQL;
+
+use Chill\MainBundle\Entity\Country;
+use Doctrine\ORM\EntityManagerInterface;
+use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
+
+/**
+ * @internal
+ * @coversNothing
+ */
+final class JsonExtractTest extends KernelTestCase
+{
+    private EntityManagerInterface $em;
+
+    protected function setUp(): void
+    {
+        self::bootKernel();
+
+        $this->em = self::$container->get(EntityManagerInterface::class);
+    }
+
+    public function dataGenerateDql(): iterable
+    {
+        yield ['SELECT JSON_EXTRACT(c.name, \'fr\') FROM ' . Country::class . ' c', []];
+
+        yield ['SELECT JSON_EXTRACT(c.name, :lang) FROM ' . Country::class . ' c', ['lang' => 'fr']];
+    }
+
+    /**
+     * @dataProvider dataGenerateDql
+     */
+    public function testJsonExtract(string $dql, array $args)
+    {
+        $results = $this->em->createQuery($dql)
+            ->setMaxResults(2)
+            ->setParameters($args)
+            ->getResult();
+
+        $this->assertIsArray($results, 'simply test that the query return a result');
+    }
+}