✨(models) add MailDomain status

Add some status to allow to create mailboxes only for an active domain

src/backend/mailbox_manager/migrations/0006_maildomain_status.py

@@ -0,0 +1,18 @@
+# Generated by Django 5.0.6 on 2024-07-06 23:14
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('mailbox_manager', '0005_alter_maildomain_slug'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='maildomain',
+            name='status',
+            field=models.CharField(choices=[('pending', 'Pending'), ('enabled', 'Enabled'), ('failed', 'Failed'), ('disabled', 'Disabled')], default='pending', max_length=10),
+        ),
+    ]