Add controllers and packages for security keys

app/Transformers/Api/Client/SecurityKeyTransformer.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace Pterodactyl\Transformers\Api\Client;
+
+use Pterodactyl\Models\SecurityKey;
+
+class SecurityKeyTransformer extends BaseClientTransformer
+{
+    public function getResourceName(): string
+    {
+        return SecurityKey::RESOURCE_NAME;
+    }
+
+    public function transform(SecurityKey $model): array
+    {
+        return [
+            'uuid' => $model->uuid,
+            'name' => $model->name,
+            'type' => $model->type,
+            'public_key_id' => base64_encode($model->public_key_id),
+            'created_at' => self::formatTimestamp($model->created_at),
+            'updated_at' => self::formatTimestamp($model->updated_at),
+        ];
+    }
+}