add EmailConfirmationToken persistence: model, migration, eloquent + fake repo

backend/app/Email/EmailConfirmationToken/EmailConfirmationTokenRepository.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace App\Email\EmailConfirmationToken;
+
+use App\User\User;
+
+interface EmailConfirmationTokenRepository
+{
+    public function create(
+        CreateEmailConfirmationTokenDto $dto,
+    ): EmailConfirmationToken;
+
+    public function findByToken(string $token): ?EmailConfirmationToken;
+
+    public function findByUser(User $user): ?EmailConfirmationToken;
+
+    public function delete(int $id): void;
+}