some data in msgraph synchro and answer on calendar invite

src/Bundle/ChillCalendarBundle/Entity/Invite.php

@@ -36,6 +36,16 @@ class Invite implements TrackUpdateInterface, TrackCreationInterface
 
     public const PENDING = 'pending';
 
+    /**
+     * all statuses in one const.
+     */
+    public const STATUSES = [
+        self::ACCEPTED,
+        self::DECLINED,
+        self::PENDING,
+        self::TENTATIVELY_ACCEPTED,
+    ];
+
     public const TENTATIVELY_ACCEPTED = 'tentative';
 
     /**