feat: add activity completion logic for courses

Introduced a new script to set activity completion for a user in a course. Ensures completion is enabled for the course module before marking activities as completed. This enhancement streamlines tracking of user progress within courses.

completion.php

@@ -0,0 +1,24 @@
+<?php
+
+require_once($CFG->libdir.'/completionlib.php');
+
+function set_activity_completion($course, $cm, $userId) {
+    // Ensure completion is enabled for the course module.
+    $completion = new completion_info($course);
+    
+    if ($completion->is_enabled($cm)) {
+        // Mark the activity as completed for this user.
+        $completion->update_state($cm, COMPLETION_COMPLETE, $userId);
+    }
+}
+
+
+$courseid = required_param('courseid', PARAM_INT);
+$cmid = required_param('cmid', PARAM_INT);
+
+$userid = $USER->id;
+
+$course = get_course($courseid);
+$cm = get_coursemodule_from_id(null, $cmid);
+
+set_activity_completion($course, $cm, $userid);