misc: move interval module in chrono.utils (#76335)

Just some cleaning.

chrono/agendas/models.py

@@ -74,9 +74,9 @@ from django.utils.translation import gettext
 from django.utils.translation import gettext_lazy as _
 from django.utils.translation import ngettext, pgettext_lazy
 
-from chrono.interval import Interval, IntervalSet
 from chrono.utils.date import get_weekday_index
 from chrono.utils.db import ArraySubquery, SumCardinality
+from chrono.utils.interval import Interval, IntervalSet
 from chrono.utils.misc import AgendaImportError, ICSError, clean_import_data, generate_slug
 from chrono.utils.publik_urls import translate_from_publik_url
 from chrono.utils.requests_wrapper import requests as requests_wrapper

tests/test_interval.py

@@ -1,6 +1,6 @@
 import pytest
 
-from chrono.interval import Interval, IntervalSet
+from chrono.utils.interval import Interval, IntervalSet
 
 
 def test_interval_set_merge_adjacent():