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/ListWorkspacesTest.php

@@ -0,0 +1,39 @@
+<?php
+
+use App\Models\User;
+use Laravel\Sanctum\Sanctum;
+
+use function Pest\Laravel\get;
+
+test('list all workspaces of a user', function () {
+    $user = User::factory()->create();
+    $workspace = createUserWorkspace($user);
+
+    $anotherUser = User::factory()->create();
+    $anotherWorkspace = createUserWorkspace($anotherUser);
+
+    Sanctum::actingAs(
+        $user,
+        ['list-workspaces']
+    );
+
+    get(route('zapier.workspaces'))
+        ->assertOk()
+        ->assertJsonCount(1)
+        ->assertJson([
+            [
+                'id' => $workspace->id,
+                'name' => $workspace->name,
+            ]
+        ]);
+});
+
+test('cannot list workspaces without a corresponding ability', function () {
+    $user = User::factory()->create();
+    $workspace = createUserWorkspace($user);
+
+    Sanctum::actingAs($user);
+
+    get(route('zapier.workspaces'))
+        ->assertForbidden();
+});