Add assignee changed notification event support

app/Enums/NotificationEventType.php

@@ -6,12 +6,14 @@ enum NotificationEventType: string
 {
     case TicketStatusChanged = 'ticket_status_changed';
     case TicketCreate = 'ticket_create';
+    case TicketAssigneeChanged = 'ticket_assignee_changed';
 
     public function label(): string
     {
         return match ($this) {
             self::TicketStatusChanged => 'Ticket status changed',
             self::TicketCreate => 'Ticket create',
+            self::TicketAssigneeChanged => 'Assignee changed',
         };
     }
 

app/Enums/NotificationFilterAttribute.php

@@ -13,6 +13,10 @@ enum NotificationFilterAttribute: string
     case TicketUrl = 'ticket.url';
     case ActorId = 'actor.id';
     case ActorName = 'actor.name';
+    case AssigneeFromId = 'assignee.from.id';
+    case AssigneeFromName = 'assignee.from.name';
+    case AssigneeToId = 'assignee.to.id';
+    case AssigneeToName = 'assignee.to.name';
     case StatusFromId = 'status.from.id';
     case StatusFromLabel = 'status.from.label';
     case StatusToId = 'status.to.id';
@@ -30,6 +34,10 @@ enum NotificationFilterAttribute: string
             self::TicketUrl => 'Ticket URL',
             self::ActorId => 'Actor ID',
             self::ActorName => 'Actor name',
+            self::AssigneeFromId => 'From assignee ID',
+            self::AssigneeFromName => 'From assignee name',
+            self::AssigneeToId => 'To assignee ID',
+            self::AssigneeToName => 'To assignee name',
             self::StatusFromId => 'From status ID',
             self::StatusFromLabel => 'From status label',
             self::StatusToId => 'To status ID',