feat: misc additions

- Detect extensions that didn't update between updates
- Add composer why not command where approriate (when extension didn't update, when major update failed)
- Detect incompatible extensions in major update failure and show the extensions in the frontend
- Create last update run setting value which holds the state of the latest update runs
- Other fixes

extensions/package-manager/src/Api/Controller/WhyNotController.php

@@ -0,0 +1,47 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * For detailed copyright and license information, please view the
+ * LICENSE file that was distributed with this source code.
+ */
+
+namespace Flarum\PackageManager\Api\Controller;
+
+use Flarum\Bus\Dispatcher;
+use Flarum\Http\RequestUtil;
+use Flarum\PackageManager\Command\WhyNot;
+use Illuminate\Support\Arr;
+use Laminas\Diactoros\Response\JsonResponse;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Server\RequestHandlerInterface;
+use Psr\Http\Message\ServerRequestInterface;
+
+class WhyNotController implements RequestHandlerInterface
+{
+    /**
+     * @var Dispatcher
+     */
+    protected $bus;
+
+    public function __construct(Dispatcher $bus)
+    {
+        $this->bus = $bus;
+    }
+
+    public function handle(ServerRequestInterface $request): ResponseInterface
+    {
+        $actor = RequestUtil::getActor($request);
+        $package = Arr::get($request->getParsedBody(), 'data.package', '');
+        $version = Arr::get($request->getParsedBody(), 'data.version', '*');
+
+        $whyNot = $this->bus->dispatch(
+            new WhyNot($actor, $package, $version)
+        );
+
+        return new JsonResponse([
+            'data' => compact('whyNot')
+        ]);
+    }
+}