chore: notifications (#1515)

* chore: add triggered by details for notifications

* dev: update issue activity json to include extra fields

* dev: triggered_by details

* dev: add bot filtering

* dev: unread notification count endpoint

* dev: update endpoint to send count for all notification types

apiserver/plane/api/serializers/notification.py

@@ -1,9 +1,12 @@
 # Module imports
 from .base import BaseSerializer
+from .user import UserLiteSerializer
 from plane.db.models import Notification
 
 class NotificationSerializer(BaseSerializer):
 
+    triggered_by_details = UserLiteSerializer(read_only=True, source="triggered_by")
+
     class Meta:
         model = Notification
         fields = "__all__"