api(application): add 'version' endpoint

app/Http/Controllers/Api/Application/VersionController.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace Pterodactyl\Http\Controllers\Api\Application;
+
+use Illuminate\Http\JsonResponse;
+use Pterodactyl\Services\Helpers\SoftwareVersionService;
+
+class VersionController extends ApplicationApiController
+{
+    /**
+     * @var \Pterodactyl\Services\Helpers\SoftwareVersionService
+     */
+    private SoftwareVersionService $softwareVersionService;
+
+    /**
+     * VersionController constructor.
+     *
+     * @param \Pterodactyl\Services\Helpers\SoftwareVersionService $softwareVersionService
+     */
+    public function __construct(SoftwareVersionService $softwareVersionService)
+    {
+        parent::__construct();
+
+        $this->softwareVersionService = $softwareVersionService;
+    }
+
+    /**
+     * ?
+     */
+    public function __invoke()
+    {
+        return new JsonResponse($this->softwareVersionService->getVersionData());
+    }
+}