♻️(plugins) rewrite plugin system as django app

This allow more flexibility around the installed plugins, this will
allow to add models in plugins if needed.

src/backend/plugins/la_suite/hooks.py

@@ -0,0 +1,32 @@
+"""
+Hooks registration for the la_suite plugin.
+
+This module is automagically loaded by the plugin system.
+Putting hooks registration here allows to test the "utils"
+function without registering the hook unwillingly.
+"""
+
+from core.plugins.registry import register_hook
+
+from plugins.la_suite.hooks_utils.all_organizations import (
+    get_organization_name_and_metadata_from_siret,
+)
+from plugins.la_suite.hooks_utils.communes import CommuneCreation
+
+
+@register_hook("organization_created")
+def get_organization_name_and_metadata_from_siret_hook(organization):
+    """After creating an organization, update the organization name & metadata."""
+    get_organization_name_and_metadata_from_siret(organization)
+
+
+@register_hook("organization_created")
+def commune_organization_created(organization):
+    """After creating an organization, update the organization name."""
+    CommuneCreation().run_after_create(organization)
+
+
+@register_hook("organization_access_granted")
+def commune_organization_access_granted(organization_access):
+    """After granting an organization access, check for needed domain access grant."""
+    CommuneCreation().run_after_grant_access(organization_access)