Plugins base (#613)

* wip

* wip

* cleanup

* notification channels

* phpstan

* services

* remove server types

* refactoring

* refactoring

app/SiteFeatures/FeatureInterface.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace App\SiteFeatures;
+
+use App\DTOs\DynamicForm;
+use Illuminate\Http\Request;
+
+interface FeatureInterface
+{
+    public function name(): string;
+
+    public function active(): bool;
+
+    public function form(): ?DynamicForm;
+
+    public function handle(Request $request): void;
+}