🗃️(models) add MailDomain, MailDomainAccess and Mailbox models

Additional app and models to handle email addresses creation in Desk.

src/backend/mailbox_manager/factories.py

@@ -0,0 +1,49 @@
+"""
+Mailbox manager application factories
+"""
+
+import factory.fuzzy
+from faker import Faker
+
+from core import factories as core_factories
+from core import models as core_models
+
+from mailbox_manager import models
+
+fake = Faker()
+
+
+class MailDomainFactory(factory.django.DjangoModelFactory):
+    """A factory to create mail domain."""
+
+    class Meta:
+        model = models.MailDomain
+
+    name = factory.Faker("domain_name")
+
+
+class MailDomainAccessFactory(factory.django.DjangoModelFactory):
+    """A factory to create mail domain accesses."""
+
+    class Meta:
+        model = models.MailDomainAccess
+
+    user = factory.SubFactory(core_factories.UserFactory)
+    domain = factory.SubFactory(MailDomainFactory)
+    role = factory.fuzzy.FuzzyChoice([r[0] for r in core_models.RoleChoices.choices])
+
+
+class MailboxFactory(factory.django.DjangoModelFactory):
+    """A factory to create mailboxes for mail domain members."""
+
+    class Meta:
+        model = models.Mailbox
+
+    class Params:
+        """Parameters for fields."""
+
+        full_name = factory.Faker("name")
+
+    local_part = factory.LazyAttribute(lambda a: a.full_name.lower().replace(" ", "."))
+    domain = factory.SubFactory(MailDomainFactory)
+    secondary_email = factory.Faker("email")