Add Loki and Sentinel utility classes for web API endpoints

- Implemented LokiUtils class with GET and POST endpoints for managing scripts, jobs, and payloads.
- Added SentinelUtils class with GET and POST endpoints for managing events, rules, devices, and notifications.
- Both classes include error handling and JSON response formatting.

loki/payloads/rickroll.js

@@ -0,0 +1,6 @@
+// Rickroll — Opens browser to a famous URL (harmless test)
+layout('us');
+delay(1000);
+press("GUI r");
+delay(500);
+type("https://www.youtube.com/watch?v=dQw4w9WgXcQ\n");