feat(core): Add Ticket Category API v2 endpoint

ref: #248 #365

app/core/serializers/ticket.py

@@ -10,6 +10,7 @@ from api.exceptions import UnknownTicketType
 from core.models.ticket.ticket import Ticket
 
 from core.fields.badge import Badge, BadgeField
+from core.serializers.ticket_category import TicketCategoryBaseSerializer
 
 
 
@@ -160,6 +161,8 @@ class TicketViewSerializer(TicketModelSerializer):
 
     assigned_teams = TeamBaseSerializer(many=True)
 
+    category = TicketCategoryBaseSerializer()
+
     opened_by = UserBaseSerializer()
 
     subscribed_users = UserBaseSerializer(many=True)