Support defining #[Meta] on traits (resolve #9)

tests/Pest/TraitTest.php

@@ -0,0 +1,37 @@
+<?php
+
+use ArchTech\Enums\Meta\Meta;
+use ArchTech\Enums\Meta\MetaProperty;
+use ArchTech\Enums\Metadata;
+
+test('enums can use traits which define meta properties on themselves', function () {
+    expect(MyEnum::FOO->description())->toBe('Foo!');
+    expect(MyEnum::BAR->description())->toBe('Bar!');
+    expect(MyEnum::BAZ->description())->toBe(null);
+});
+
+enum MyEnum
+{
+    use Metadata;
+    use HasDescription;
+
+    #[Description('Foo!')]
+    case FOO;
+
+    #[Description('Bar!')]
+    case BAR;
+
+    case BAZ;
+}
+
+#[Attribute]
+class Description extends MetaProperty
+{}
+
+/**
+ * @method string|null description()
+ */
+#[Meta(Description::class)]
+trait HasDescription
+{
+}