refactor(plugins): create Field objects per field type in settings forms + handle rendering in class

update manifest.schema.json to have defaultValue type differ based on field type

modules/Plugins/Manifest/FieldInterface.php

@@ -0,0 +1,10 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Modules\Plugins\Manifest;
+
+interface FieldInterface
+{
+    public function render(string $name, mixed $value, string $class = ''): string;
+}