✨(domains) add periodic task to fetch domains status

Add celery crontab to check and update domains status.
This task calls dimail API.

src/backend/mailbox_manager/tasks.py

@@ -0,0 +1,65 @@
+"""Mailbox manager tasks."""
+
+import time
+
+import requests
+from celery import Celery
+from celery.schedules import crontab
+from celery.utils.log import get_task_logger
+
+from mailbox_manager import enums
+from mailbox_manager.models import MailDomain
+from mailbox_manager.utils.dimail import DimailAPIClient
+from people.celery_app import app as celery_app
+
+logger = get_task_logger(__name__)
+
+
+@celery_app.on_after_finalize.connect
+def setup_periodic_tasks(sender: Celery, **kwargs):
+    """Setup periodic tasks."""
+    sender.add_periodic_task(
+        crontab(hour="3", minute="45", day_of_week="1"),
+        fetch_domains_status_task.s(status=enums.MailDomainStatusChoices.ENABLED),
+        name="fetch_enabled_domains_every_monday_at_3_45",
+        serializer="json",
+    )
+    sender.add_periodic_task(
+        crontab(minute="0"),  # Run at the start of every hour
+        fetch_domains_status_task.s(status=enums.MailDomainStatusChoices.PENDING),
+        name="fetch_pending_domains_every_hour",
+        serializer="json",
+    )
+    sender.add_periodic_task(
+        crontab(minute="30"),  # Run at the 30th minute of every hour
+        fetch_domains_status_task.s(
+            status=enums.MailDomainStatusChoices.ACTION_REQUIRED
+        ),
+        name="fetch_action_required_domains_every_hour",
+        serializer="json",
+    )
+    sender.add_periodic_task(
+        crontab(minute="45"),  # Run at the 45th minute of every hour
+        fetch_domains_status_task.s(status=enums.MailDomainStatusChoices.FAILED),
+        name="fetch_failed_domains_every_hour",
+        serializer="json",
+    )
+
+
+@celery_app.task
+def fetch_domains_status_task(status: str):
+    """Celery task to call dimail to check and update domains status."""
+    client = DimailAPIClient()
+    changed_domains = []
+    for domain in MailDomain.objects.filter(status=status):
+        old_status = domain.status
+        # wait 10 seconds between each domain treatment to avoid overloading dimail
+        time.sleep(10)
+        try:
+            client.fetch_domain_status(domain)
+        except requests.exceptions.HTTPError as err:
+            logger.error("Failed to fetch status for domain %s: %s", domain.name, err)
+        else:
+            if old_status != domain.status:
+                changed_domains.append(f"{domain.name} ({domain.status})")
+    return changed_domains