added API route to fetch infos about installed plugins (#2561)

src/API/Model/Plugin.php

@@ -0,0 +1,48 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * 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\API\Model;
+
+use App\Plugin\Plugin as CorePlugin;
+use JMS\Serializer\Annotation as Serializer;
+
+/**
+ * @Serializer\ExclusionPolicy("all")
+ */
+class Plugin
+{
+    /**
+     * The plugin name, eg. "ExpensesBundle"
+     *
+     * @var string
+     *
+     * @Serializer\Expose()
+     * @Serializer\Groups({"Default"})
+     * @Serializer\Type(name="string")
+     */
+    protected $name;
+    /**
+     * The plugin version, eg. "1.14"
+     *
+     * @var string
+     *
+     * @Serializer\Expose()
+     * @Serializer\Groups({"Default"})
+     * @Serializer\Type(name="string")
+     */
+    protected $version;
+
+    public function __construct(CorePlugin $plugin)
+    {
+        $this->name = $plugin->getId();
+        $this->version = $plugin->getMetadata()->getVersion();
+    }
+}