Implemented mechanism to add/remove roles from API keys

module/Rest/src/ApiKey/Model/RoleDefinition.php

@@ -0,0 +1,39 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shlinkio\Shlink\Rest\ApiKey\Model;
+
+use Shlinkio\Shlink\Rest\ApiKey\Role;
+
+final class RoleDefinition
+{
+    private string $roleName;
+    private array $meta;
+
+    private function __construct(string $roleName, array $meta)
+    {
+        $this->roleName = $roleName;
+        $this->meta = $meta;
+    }
+
+    public static function forAuthoredShortUrls(): self
+    {
+        return new self(Role::AUTHORED_SHORT_URLS, []);
+    }
+
+    public static function forDomain(string $domainId): self
+    {
+        return new self(Role::DOMAIN_SPECIFIC, ['domain_id' => $domainId]);
+    }
+
+    public function roleName(): string
+    {
+        return $this->roleName;
+    }
+
+    public function meta(): array
+    {
+        return $this->meta;
+    }
+}