Allow to customize statistic queries (#5827)

* use TimesheetStatisticsQUery for all repository calls
* send event to customize statistics query

src/Event/TimesheetStatisticsQueryEvent.php

@@ -0,0 +1,25 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Event;
+
+use Doctrine\ORM\QueryBuilder;
+use Symfony\Contracts\EventDispatcher\Event;
+
+final class TimesheetStatisticsQueryEvent extends Event
+{
+    public function __construct(private readonly QueryBuilder $queryBuilder)
+    {
+    }
+
+    public function getQueryBuilder(): QueryBuilder
+    {
+        return $this->queryBuilder;
+    }
+}