adds user contexts to user userevents.

this is gnarly, but i can't think of a less invasive way to weave these
data points in that doesn't involve substantial refactoring of the whole
process.

src/Classes/CalendarEvent.php

@@ -156,6 +156,11 @@ class CalendarEvent
     #[IA\Expose]
     #[IA\Type('array')]
     public array $courseTerms = [];
+
+    #[IA\Expose]
+    #[IA\Type('array<string>')]
+    public array $userContexts = [];
+
     /**
      * Clean out all the data for draft or scheduled events
      *

src/Classes/CalendarEventUserContext.php

@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Classes;
+
+/**
+ * Constant interface, defines all the user contexts for calendar events.
+ * @package App\Classes
+ */
+interface CalendarEventUserContext
+{
+    public const LEARNER = 'learner';
+
+    public const INSTRUCTOR = 'instructor';
+
+    public const COURSE_DIRECTOR = 'course director';
+
+    public const COURSE_ADMINISTRATOR = 'course administrator';
+
+    public const SESSION_ADMINISTRATOR = 'session administrator';
+}