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>

tests/Feature/Zapier/ValidateAuthTest.php

@@ -0,0 +1,24 @@
+<?php
+
+use App\Models\User;
+use Laravel\Sanctum\Sanctum;
+
+use function Pest\Laravel\get;
+
+test('validate auth', function () {
+    $user = User::factory()->create();
+
+    Sanctum::actingAs($user);
+
+    get(route('zapier.validate'))
+        ->assertOk()
+        ->assertJson([
+            'name' => $user->name,
+            'email' => $user->email,
+        ]);
+});
+
+test('cannot validate auth with incorrect credentials', function () {
+    get(route('zapier.validate'))
+        ->assertUnauthorized();
+});