Add search functionality for user groups

Implemented `SearchUserGroupApiProvider` to handle user group search requests. Added `UserGroupRepository` and its interface to support search queries. Updated API specs to include user group as a searchable type.

src/Bundle/ChillMainBundle/Search/Entity/SearchUserGroupApiProvider.php

@@ -0,0 +1,59 @@
+<?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 Chill\MainBundle\Search\Entity;
+
+use Chill\MainBundle\Repository\UserGroupRepositoryInterface;
+use Chill\MainBundle\Search\SearchApiInterface;
+use Chill\MainBundle\Search\SearchApiQuery;
+use Symfony\Contracts\Translation\LocaleAwareInterface;
+
+/**
+ * Provide search api for user group.
+ */
+class SearchUserGroupApiProvider implements SearchApiInterface, LocaleAwareInterface
+{
+    private string $locale;
+
+    public function __construct(private readonly UserGroupRepositoryInterface $userGroupRepository) {}
+
+    public function setLocale(string $locale): void
+    {
+        $this->locale = $locale;
+    }
+
+    public function getLocale(): string
+    {
+        return $this->locale;
+    }
+
+    public function getResult(string $key, array $metadata, float $pertinence)
+    {
+        return $this->userGroupRepository->find($metadata['id']);
+    }
+
+    public function prepare(array $metadatas): void {}
+
+    public function provideQuery(string $pattern, array $parameters): SearchApiQuery
+    {
+        return $this->userGroupRepository->provideSearchApiQuery($pattern, $this->getLocale(), 'user-group');
+    }
+
+    public function supportsResult(string $key, array $metadatas): bool
+    {
+        return 'user-group' === $key;
+    }
+
+    public function supportsTypes(string $pattern, array $types, array $parameters): bool
+    {
+        return in_array('user-group', $types, true);
+    }
+}