feat(comments): add comments to episodes + update naming of status to post

- remove confusing counts for episode (total favourites, total reblogs)
- add comments section to
episode page to display episode comments + post replies linked to the episode

app/Models/PostModel.php

@@ -0,0 +1,56 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright  2021 Podlibre
+ * @license    https://www.gnu.org/licenses/agpl-3.0.en.html AGPL3
+ * @link       https://castopod.org/
+ */
+
+namespace App\Models;
+
+use ActivityPub\Models\PostModel as ActivityPubPostModel;
+use App\Entities\Post;
+
+class PostModel extends ActivityPubPostModel
+{
+    /**
+     * @var string
+     */
+    protected $returnType = Post::class;
+
+    /**
+     * @var string[]
+     */
+    protected $allowedFields = [
+        'id',
+        'uri',
+        'actor_id',
+        'in_reply_to_id',
+        'reblog_of_id',
+        'episode_id',
+        'message',
+        'message_html',
+        'favourites_count',
+        'reblogs_count',
+        'replies_count',
+        'created_by',
+        'published_at',
+    ];
+
+    /**
+     * Retrieves all published posts for a given episode ordered by publication date
+     *
+     * @return Post[]
+     */
+    public function getEpisodePosts(int $episodeId): array
+    {
+        return $this->where([
+            'episode_id' => $episodeId,
+        ])
+            ->where('`published_at` <= NOW()', null, false)
+            ->orderBy('published_at', 'DESC')
+            ->findAll();
+    }
+}