Add support for enum default arguments using enum cases (#1464)

* add case when default value is of type enum

* Update CHANGELOG.md

* add tests for enum arguments default values

* ignore psalm issue (built-in `\UnitEnum` class does not exists in PHP7)

* Update run-static-analysis.yml to use PHP8.1

---------

Co-authored-by: Barry vd. Heuvel <[email protected]>
Co-authored-by: Barry vd. Heuvel <[email protected]>

tests/Console/ModelsCommand/GenerateBasicPhpDocWithEnumDefaults/Models/Post.php

@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Barryvdh\LaravelIdeHelper\Tests\Console\ModelsCommand\GenerateBasicPhpDocWithEnumDefaults\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Builder;
+use Barryvdh\LaravelIdeHelper\Tests\Console\ModelsCommand\GenerateBasicPhpDocWithEnumDefaults\Enums\PostStatus;
+
+class Post extends Model
+{
+    public function scopeHasStatus(Builder $query, ?PostStatus $status = PostStatus::Published)
+    {
+        // 
+    }
+}