feat: add course completion check functionality

Introduced a new observer to handle 'course_module_completion_updated' events, updating course completion status automatically. This streamlines the user experience by notifying users of their course completion status changes. Added observer registration to events configuration and updated the plugin version details.

classes/observer.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace local_course_completion_checker;
+
+defined('MOODLE_INTERNAL') || die();
+
+class observer
+{
+    public static function check_course_completion(\core\event\course_module_completion_updated $event)
+    {
+        global $DB;
+
+        $userid = $event->relateduserid;
+        $courseid = $event->courseid;
+
+        $completion = new \completion_info($event->get_course());
+
+        if (!$completion->is_enabled()) {
+            return;
+        }
+
+        $completion->update_state();
+        \core\notification::add("Course completion status updated for user $userid in course $courseid.", \core\output\notification::NOTIFY_SUCCESS);
+    }
+}

db/events.php

@@ -0,0 +1,9 @@
+<?php
+defined('MOODLE_INTERNAL') || die();
+
+$observers = [
+    [
+        'eventname'   => '\core\event\course_module_completion_updated',
+        'callback'    => 'local_course_completion_checker_observer::check_course_completion',
+    ],
+];

version.php

@@ -0,0 +1,6 @@
+<?php
+defined('MOODLE_INTERNAL') || die();
+
+$plugin->version   = 2024102100;
+$plugin->requires  = 2021051700;
+$plugin->component = 'local_course_completion_checker';