Zapier integration (#491)

* create zapier app

* install sanctum

* move OAuthProviderController

* make `api-external` middleware

* add zapier endpoints

* add tests

* token management

* zapier event handler

* add policy

* use `slug` instead of `id`

* wip

* check policies

* change api prefix to `external`

* ui tweaks

* validate token abilities

* open zapier URL

* zapier ui tweaks

* update zap

* Fix linting

* Added sample endpoints + minor UI changes

* Run PHP code linter

---------

Co-authored-by: Julien Nahum <julien@nahum.net>

app/Http/Requests/Zapier/CreateIntegrationRequest.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace App\Http\Requests\Zapier;
+
+use App\Models\Forms\Form;
+use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Validation\Rule;
+
+class CreateIntegrationRequest extends FormRequest
+{
+    public function rules()
+    {
+        return [
+            'form_id' => [
+                'required',
+                Rule::exists(Form::getModel()->getTable(), 'slug'),
+            ],
+            'hookUrl' => [
+                'required',
+                'url',
+            ],
+        ];
+    }
+
+    public function form(): Form
+    {
+        return Form::query()
+            ->where('slug', $this->input('form_id'))
+            ->firstOrFail();
+    }
+}