Implement adding aliases for accounts

src/Frontend/Accounts/AccountAddAliasData.php

@@ -0,0 +1,28 @@
+<?php
+declare(strict_types=1);
+
+namespace MailAccountAdmin\Frontend\Accounts;
+
+use MailAccountAdmin\Common\FormData;
+
+class AccountAddAliasData extends FormData
+{
+    private string $aliasAddress;
+
+    private function __construct(string $aliasAddress)
+    {
+        $this->aliasAddress = $aliasAddress;
+    }
+
+    public static function createFromArray($raw): self
+    {
+        return new self(
+            self::validateAliasAddress(trim($raw['alias_address'] ?? '')),
+        );
+    }
+
+    public function getAliasAddress(): string
+    {
+        return $this->aliasAddress;
+    }
+}