Add history tracking functionality using django-pghistory; implement views, templates, and middleware for event serialization and context management

history/urls.py

@@ -0,0 +1,10 @@
+from django.urls import path
+from .views import HistoryTimelineView
+
+app_name = 'history'
+
+urlpatterns = [
+    path('timeline/<int:content_type_id>/<int:object_id>/', 
+         HistoryTimelineView.as_view(), 
+         name='timeline'),
+]