feat: add keys arch tests

Signed-off-by: Dusan Malusev <[email protected]>

Author: CodeLieutenant

tests/Architecture/KeysTest.php

@@ -0,0 +1,10 @@
+<?php
+
+declare(strict_types=1);
+
+use CodeLieutenant\LaravelCrypto\Contracts\KeyLoader;
+
+arch('keys')
+    ->expect('CodeLieutenant\LaravelCrypto\Keys')
+    ->toBeClasses()
+    ->toImplement(KeyLoader::class);